P0171 code - Looking for leaks help :) Engine Pics

[sergioiacobucci]

Hi,

I am brand new to the forum! Go easy on me

My friend is having some issues with her A4 2.0 FSI '56 plate. It is showing the emissions light and so we got it scanned and the code is P0171 'Too lean on bank 1'. I have done lots and lots of searching around and it has led me to try the following things:

1. Cleaned the MAF sensor with electrical contact cleaner
2. Search for leaks on vacuum hoses etc

I have also heard the that the crankshaft breather hose is quite a common problem and I don't want to sound stupid but I cannot find it! Well at least I think I haven't.

So I have attached some pics of the engine bay in the hope that people could point me towards where to look and common hoses that split. Also I am only looking at the hoses does someone have a good technique to find the leak? I would imagine spraying it with something and running the engine may show a leak but I am not sure what to use?

Lastly, I have noticed that there is a build up and very small leak of water (which I have attached pics of) could this have leaked antifreeze and then damaged a vacuum pipe below?

Just some other info in case it helps - the car seems to idle fine most of the time and there is very little sign of anything being wrong when apart from the odd occasion when the car shakes on idle to quite an excessive amount, but the revs stay pretty constant.

Thank you very much in advance!

[a8 tech]

goto mvb's for lambda then spray a cleaning agent like brake cleaner around all the breather pipes

You have to much air or insufficient fuel

watch the mvb voltage on the lambda

if it goes mad then you have found the leak

the large circular pcv valve on the rocker next to your coolant pipe is a common fault

the valve flap breaks away inside, remove the unit and suck on the pipe to see if the flap works

acf valve or pipe blocked another and the good old air filter but in your photo you have a missing part off the air filter?

mvbs


Unified measured value blocks - petrol engines
2.0L T-FSI version 1.24


Breakdown of measured value blocks
001 - 009 ....... General representation of system status
010 - 019 ....... Ignition
020 - 029 ....... Knock control
030 - 049 ....... Lambda control / catalytic converter
050 - 059 ....... Speed control
060 - 069 ....... Throttle control
070 - 079 ....... Emissions reduction
080 - 089 ....... Special functions / Ready bits
090 - 097 ....... Power increase
098 - 100 ....... Compatibility blocks
101 - 109 ....... Fuel injection
110 - 119 ....... Load recording
120 - 129 ....... Communication between control units
130 - 139 ....... Cooling
170 ....... Starter control

Measured value block 001:
General
1)Engine speed [rpm]
2)Coolant temp. [°C]
3)Lambda control value bank 1[%]
4)Setting conditions for basic setting
1 2 3 4 5 6 7 8
X Coolant temp.>80°C -
X Engine speed<2000 rpm
X Throttle valve closed
X Lambda control OK
X Idling speed switch closed
X AC compressor off
X Cat. temp. reached
X No fault in system
(Condition met = 1; condition not met = 0)

Measured value block 002:
General (systems with one air mass meter)
1)Engine speed [rpm]
2)Load [%]
3)Mean injection time [ms]
4)Air mass [g/s]

Measured value block 003:
General (systems with one air mass meter)
1)Engine speed [rpm]
2)Air mass [g/s]
3)Throttle angle (potentiometer) [%]
4)Ignition timing angle (actual) [° b.TDC ]

Measured value block 004:
General
1)Engine speed [rpm]
2)Voltage [V]
3)Coolant temp. [°C]
4)Intake air temp. [°C]

Measured value block 005:
General
1)Engine speed [rpm]
2) Load [%]
3)Road speed [km/h]
4)Operating status (LL, TL, VL, S, BA)
LL: Idling speed
TL: Part throttle
VL: Full throttle
S : Overrun
BA: Acceleration enrichment

Measured value block 006:
General
1)Engine speed [rpm]
2)Load [%]
3)Intake air temp. [°C]
4)Altitude correction [%]
(Ratio to reference level; 0% = 0m; -50% = 5,000m; +20% = -2000m)

Measured value block 007:
General
1)Engine speed [rpm]
2) Load [%]
3)Coolant temp. [°C]
4)BDE mode
1 2 3 4 5 6 7 8
X Homogeneous
X Homogeneous lean
X Homogeneous stratified
X Stratified
X Stratified cat.heating
X Vacant
X Vacant
X Homogeneous knocking protection
If stratified prohibited, via 2 ASCII characters SV

Measured value block 008:
Vacant

Measured value block 009:
ESI (extended service intervals)
1)Oil level [mm]
2)Oil warning threshold [mm]
3)Fuel consumption signal [litres]
4)Consumption equivalent

Measured value block 010:
Ignition
1)Engine speed [rpm]
2)Load [%]
3)Throttle angle (potentiometer) [%]
4)Ignition timing angle (actual) [° b.TDC ]

Measured value block 011:
Ignition
1)Engine speed [rpm]
2)Coolant temp. [°C]
3)Intake air temp. [°C]
4)Ignition timing angle (actual) [° b.TDC ]

Measured value block 012:
Distributor setting
Vacant

Measured value block 013:
Vacant

Measured value block 014:
Misfire detection
1)Engine speed [rpm]
2)Load [%]
3)Misfire totaliser [n]
4)Misfire detection [activated/disabled]

Measured value block 015:
Misfire detection
1)Counter cyl. 1 [n]
2)Counter cyl. 2 [n]
3)Counter cyl. 3 [n]
4)Misfire detection [activated/disabled]

Measured value block 016:
Misfire detection
1)Counter cyl. 4 [n]
2)Counter cyl. 5 [n]
3)Counter cyl. 6 [n]
4)Misfire detection [activated/disabled]

Measured value block 017:
Misfire detection
Vacant

Measured value block 018:
Load/speed window, misfire detection
(If no misfires detected: 0 at all positions)
1)Lower engine speed threshold [rpm]
2)Upper engine speed threshold [rpm]
3)Lower load threshold [%]
4)Upper load threshold [%]

Measured value block 019:
Vacant

Measured value block 020:
Knock control
1)Ignition retard cyl. 1 [°CA]
2)Ignition retard cyl. 2 [°CA]
3)Ignition retard cyl. 3 [°CA]
4)Ignition retard cyl. 4 [°CA]

Measured value block 021:
Knock control
Vacant

Measured value block 022:
Knock control
1)Engine speed [rpm]
2) Load [%]
3)Ignition retard cyl. 1 [°CA]
4)Ignition retard cyl. 2 [°CA]

Measured value block 023:
Knock control
1)Engine speed [rpm]
2) Load [%]
3)Ignition retard cyl. 3 [°CA]
4)Ignition retard cyl. 4 [°CA]

Measured value block 024:
Knock control
Vacant

Measured value block 025:
Knock control
Vacant

Measured value block 026:
Knock sensor voltages
1)Cyl. 1 [V]
2)Cyl. 2 [V]
3)Cyl. 3 [V]
4)Cyl. 4 [V]

Measured value block 027:
Knock sensor voltages
Vacant

Measured value block 028: Basic setting
Test knock sensors
- Function 04 (Basic setting)
- Activate short trip
- Press brake pedal and at same time press accelerator pedal down fully:
- Engine speed automatically adjusts to 2200 rpm -> "Test ON"
- Wait for "Syst. OK" to be reached in the 4th field
1)Engine speed [rpm]
2) Load [%]
3)Coolant temp. [°C]
4)Result [Test ON/Test OFF/Sys. OK/Sys. n.OK]

Measured value block 029:
Reserved fir knock control adaption
Vacant

Measured value block 030: 1-bank systems
Lambda probes, status
1)Bank 1, probe 1
(Meaning of 5-digit number block)
4 3 2 1 0
X Control active
X Probe ready
X Probe heating on
X Cat.clearing active
X Vacant
1: Condition met
0: Condition not met

2)Bank 1, probe 2
(Meaning of 4-digit number block)
3 2 1 0
X Control active (I-component)
X Probe ready
X Probe heating on
X Control active (P-component)
1: Condition met
0: Condition not met

3)Bank 1, probe 3
Vacant

4)Vacant

Measured value block 031: 1-bank systems
Continuous lambda probes
1)Lambda actual bank 1 []
2)Lambda specification bank 1 []
3)Not used
4)Not used

Measured value block 032: 1-bank systems
Lambda probe learned values (max. value)
1)Bank 1, probe 1, idle [%]
2)Bank 1, probe 1, part throttle [%]
3)Not used
4)Not used

Measured value block 033: 1-bank systems
Lambda control value
1)Bank 1, control value [%]
2)Bank 1, lambda probe voltage [V]
3)Not used
4)Not used

Measured value block 034: Basic setting
Lambda probe ageing check bank 1 or 3 before cat - continuous probes
- Function 04 (Basic setting)
- Activate short trip
- Press brake pedal and at same time press accelerator pedal down fully:
- Engine speed automatically adjusts to 1800 rpm -> "Test ON"
- Wait for "B1-S1 OK" to be reached in the 4th field
1)Engine speed [rpm]
2)Exhaust/cat.temperature bank 1 or 3 [°C]
3)Dynamic value bank 1 or 3 [ ]
4)Result [Test ON / Test OFF / B1-S1 OK / B1-S1 n.OK]

Measured value block 035: 2-bank systems Basic setting
Vacant

Measured value block 036: 1-bank systems Basic setting
Lambda probe readiness after cat.
- Function 04 (Basic setting)
- Activate short trip
- Press brake pedal and at same time press accelerator pedal down fully:
- Engine speed automatically adjusts to 1800 rpm -> "Test ON"
- Wait for "B1-S2 OK" to appear in the 2nd field and "B2-S2 OK" in the 4th.
1)Probe voltage bank 1, probe 2 [V]
2)Result [Test ON/Test OFF/B1-S2 OK/B1-S2 n.OK]
3)Probe voltage bank 1, probe 3 [V]
4)Result [Test ON/Test OFF/B1-S3 OK/B1-S3 n.OK]

Measured value block 037: Basic setting
Lambda probes bank 1, delta-lambda - continuous probes
- Function 04 (Basic setting)
- Activate short trip
- Press brake pedal and at same time press accelerator pedal down fully:
- Engine speed automatically adjusts to 1800 rpm -> "Test ON"
- Wait for "B1-S1 OK" to appear in the 4th field.
1) Load [%]
2)Bank 1, probe 2: Lambda probe voltage after cat. [V]
3)Bank 1: Duty cycle shift [ms]
4)Result [Test ON / Test OFF / B1-S1. OK / B1-S1. nOK]

Measured value block 038: 2-bank systems Basic setting
Vacant

Measured value block 039: 2-bank systems Basic setting
Vacant

Measured value block 040: 2-bank systems
Vacant

Measured value block 041: 1/2-bank systems
Lambda probe heater, bank 1
1)Internal resistance bank 1, probe 1 []
2)Status/duty cycle bank 1, probe 1 [Htg.bC.ON/Htg.bC.OFF/%]
3)Internal resistance bank 1, probe 2 []
4)Status bank 1, probe 2 [Htg.aC.ON/Htg.aC.OFF]

Measured value block 042: 1-bank systems
Vacant

Measured value block 043: Basic setting
Lambda probe ageing after cat., bank 1
- Function 04 (Basic setting)
- Activate short trip
- Press brake pedal and at same time press accelerator pedal down fully:
- Engine speed automatically adjusts to 1800 rpm -> "Test ON"
- Wait for "B1-S2 OK" to appear in the 4th field.
1)Engine speed [rpm]
2)Exhaust/cat.temperature bank 1 [°C]
3)Lambda probe voltage bank 1, probe 2 [V]
4)Result [Test ON / Test OFF / B1-S2 OK / B1-S2 n.OK]
or [Test ON / Test OFF / B3-S2 OK / B3-S2 n.OK]

Measured value block 044: Basic setting
Vacant

Measured value block 045:
Vacant

Measured value block 046: Basic setting
Cat. conversion test, bank 1 / bank 3
- Short trips in blocks 034 / 035 / 036 / 037 / 038 / 039 / 043 / 044
must be completed "OK"
- Function 04 (Basic setting)
- Activate short trip
- Press brake pedal and at same time press accelerator pedal down fully:
- Engine speed automatically adjusts to 1800 rpm -> "Test ON"
- Wait for "CatB1 OK" to appear in the 4th field.
1)Engine speed [rpm]
2)Cat.temperature bank 1 [°C]
3)Readout cat. conversion bank 1
4)Result [Test ON / Test OFF / CatB1 OK / CatB1 n.OK]
or [Test ON / Test OFF / CatB3 OK / CatB3 n.OK]

Measured value block 047: Basic setting
Vacant

Measured value block 048: Basic setting
Vacant

Measured value block 049: Basic setting
Vacant

Measured value block 050: Systems without rear window/air conditioner readiness isolation
Engine speed increase
1)Actual engine speed [rpm]
2)Specified engine speed [rpm]
3)Rear window heating/AC request [on/off]
4)AC compressor [on/off/lower]

Measured value block 050: Systems with rear window/air conditioner readiness isolation
Engine speed increase
1)Actual engine speed [rpm]
2)Specified engine speed [rpm]
3)AC request [on/off]
4)AC compressor [on/off/lower]

Measured value block 051:
Engine speed, gear shifts
1)Actual engine speed [rpm]
2)Specified engine speed [rpm]
3)Gear (automatic only) [0-7]
P,N = 0
Gear = 1 - 6
R = 7
4)Battery voltage [V]

Measured value block 052: Systems with rear window/air conditioner readiness isolation
Engine speed increase
1)Actual engine speed [rpm]
2)Specified engine speed [rpm]
3)Air conditioner readiness [off/on]
4)Rear window/front windscreen heating [on/off]

Measured value block 053:
Engine speed increase based on alternator load
1)Actual engine speed [rpm]
2)Specified engine speed [rpm]
3)Battery voltage [V]
4) Alternator load [% or NM / W]

Measured value block 054:
Idling speed positioner/switch in electronic throttle systems
1)Actual engine speed [rpm]
2)Operating status [LL, TL, VL, SA, BA]
Neutral
LL: Idling speed
TL: Part throttle
VL: Full throttle
S : Overrun
BA: Acceleration enrichment
3)Accelerator position sender 1 (potentiometer) [%]
4)Throttle actuator angle (potentiometer) [%]

Measured value block 055: Systems without rear window/air conditioner readiness isolation
Idling speed stabilisation
1)Actual engine speed [rpm]
2)Idling speed controller []
3)Current learned value, idling speed stabilisation [%]
4)Operating states
(Meaning of 6-digit readout)
1 2 3 4 5 6
X AC compressor On
X Gear engaged
X AC readiness/rear window heater On
0 Always 0
X Steering at full lock
X Windscreen heater
(Condition met = 1; condition not met = 0)

Measured value block 055: Systems with rear window/air conditioner readiness isolation
Idling speed stabilisation
1)Actual engine speed [rpm]
2)Idling speed controller []
3)Current learned value, idling speed stabilisation [%]
4)Operating states
(Meaning of 6-digit readout)
1 2 3 4 5 6
X AC compressor On
X Gear engaged
X AC readiness On
X Rear window heater On
X Steering at full lock
X Windscreen heater
(Condition met = 1; condition not met = 0)

Measured value block 056: Systems without rear window/air conditioner readiness isolation
Idling speed stabilisation
1)Actual engine speed [rpm]
2)Specified engine speed [rpm]
3)Idling speed controller []
4)Operating states
(Meaning of 6-digit readout)
1 2 3 4 5 6
X AC compressor On
X Gear engaged
X AC readiness/rear window heater On
0 Always 0
X Steering at full lock
X Windscreen heater
(Condition met = 1; condition not met = 0)

Measured value block 056: Systems with rear window/air conditioner readiness isolation
Idling speed stabilisation
1)Actual engine speed [rpm]
2)Specified engine speed [rpm]
3)Air mass, idling speed controller []
4)Operating states
(Meaning of 6-digit readout)
1 2 3 4 5 6
X AC compressor On
X Gear engaged
X AC readiness On
X Rear window heater On
X Steering at full lock
X Windscreen heater
(Condition met = 1; condition not met = 0)

Measured value block 057:
Idling speed stabilisation, pressure signal AC compressor / torque signal
1)Actual engine speed [rpm]
2)Specified engine speed [rpm]
3)AC compressor [on/off/lower]
4)Pressure pickup duty cycle/Pressure from air conditioner [%/bar]

Measured value block 058: Systems with engine mounting only
Vacant

Measured value block 059
Vacant

Measured value block 060: Vehicles with electronic throttle Basic setting
Electronic throttle adaption
- Function 04 (Basic setting)
- Activate short trip
- Wait for "ADP OK" to appear in the 4th field
1)Throttle angle (potentiometer 1) [%]
2)Throttle angle (potentiometer 2) [%]
3)Throttle valve adaption status [n]
4)Operating status [Text: ADP runs/ADP OK/ERROR]

Measured value block 061: Systems without rear window/air conditioner readiness isolation
ESB/electronic throttle
1)Engine speed [rpm]
2)Battery voltage [V]
3)Throttle valve angle [%]
4) Operational status
(Meaning of 4-digit readout)
1 2 3 4
X AC compressor On
X Gear engaged
X AC readiness/rear window heater On
0 Always 0
(Condition met = 1; condition not met = 0)

Measured value block 061: Systems with rear window/air conditioner readiness isolation
ESB/electronic throttle
1)Engine speed [rpm]
2)Battery voltage [V]
3)Throttle valve angle [%]
4) Operational status
(Meaning of 4-digit readout)
1 2 3 4
X AC compressor On
X Gear engaged
X AC readiness On
X Rear window heater On
(Condition met = 1; condition not met = 0)

Measured value block 062:
Electronic throttle, potentiometer voltages ratio U/Uref
1)Throttle valve angle (potentiometer 1) [%]
2)Throttle valve angle (potentiometer 2) [%]
3)Pedal sender angle (potentiometer 1) [%]
4)Pedal sender angle (potentiometer 2) [%]

Measured value block 063: Basic setting
Kickdown adaption (only in vehicles with automatic gearbox)
- Function 04 (basic setting)
- Activate short trip
- Press accelerator pedal fully down following prompt
- Wait for "ADP OK" to be reached in the 4th field
1)Pedal sender angle (potentiometer 1) [%]
2)Learned kickdown point (potentiometer 1) [V]
3)Kickdown
4)Result (Press / ADP.runs / ADP.OK / ERROR)

Measured value block 064:
Throttle valve potentiometer adaption values
1)Potentiometer 1 lower adaption [V]
2)Potentiometer 2 lower adaption [V]
3)Emergency air gap potentiometer 1 [V]
4)Emergency air gap potentiometer 2 [V]

Measured value block 065:
Electronic throttle original adaption only for P/N system with EGR
1)Throttle valve angle potentiometer 1 [%]
2)Throttle valve angle potentiometer 2 [%]
3)DVE adaption status [n]
4)Operating status [Text: ADP runs/ADP OK/ERROR]

Measured value block 066: for 4-position operating lever
CCS enabled
1)Road speed actual [km/h]
2)Switch settings
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X Brake light switch Pedal pressed
X Brake pedal switch Pedal pressed
X Clutch switch Pedal pressed
X CCS function enabled
X ACC-CU fitted (ADR)
X Main switch clocked
X CCS status for CAN
X CCS status for CAN
3)Specified road speed [km/h]
4)Switch settings for 4-position operating lever
(Meaning of 8-digit readout)
1 2 3 4
X CCS on/off
X Set (CCS on)
X Reduce
X Increase

Measured value block 066: for 4-position operating lever with CAN
CCS enabled
1)Road speed actual [km/h]
2)Switch settings
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X Brake light switch Pedal pressed
X Brake pedal switch Pedal pressed
X Clutch switch Pedal pressed
X CCS function enabled
X ACC-CU fitted (ADR)
X Main switch clocked
X CCS status for CAN
X CCS status for CAN
3)Specified road speed [km/h]
4)Switch settings for 4-position operating lever
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X CCS on/off (CAN)
X Set (CCS on)
X Reduce
X Increase
X Vacant
X Vacant
X Vacant
X CCS on (hardware pin)

Measured value block 066: for 6-position operating lever
CCS enabled
1)Road speed actual [km/h]
2)Switch settings
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X Brake light switch Pedal pressed
X Brake pedal switch Pedal pressed
X Clutch switch Pedal pressed
X CCS function enabled
X ACC-CU fitted (ADR)
X Main switch clocked
X CCS status for CAN
X CCS status for CAN
3)Specified road speed [km/h]
4)Switch settings for 6-position operating lever
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X CCS on/off
X Set (CCS on)
X Reduce
X Increase
X Set
X Resume
X Vacant
X CCS on (hardware pin)

Measured value block 067:
Vacant

Measured value block 068:
Gearbox status
1)Engine speed [rpm]
2) Load [%]
3)Gear [0-7]
P,N = 0
Gear = 1 - 6
R = 7
4)Converter/clutch status [text: TCC open / TTC close / TCC control]

Measured value block 069:
Vacant

Measured value block 070: Basic setting
Tank breather valve check
- Function 04 (Basic setting)
- Activate short trip
- Idle
- Wait for "TBV OK" to appear in the 4th field.
1)Opening angle TBV [%] (duty cycle)
2)Lambda controller/diagnosis value with active diagnosis [%]
3)Idling speed controller/diagnosis value with active diagnosis [%/g/sec/ ]
4)Result [Test ON / Test OFF / TBV OK / TBV n.OK]

Measured value block 071: Basic setting
Tank leak test (LDP, only with LEV)
- Function 04 (Basic setting)
- Activate short trip
- Idle
- Wait for "Syst. OK" to appear in the 4th field.
1)Status of reed contact [text: Reed open / Reed closed]
2)Fault message [text: Small leak / Large leak / Abort]
3)Test status [- / Syst.test / Measurement / Meas.END]
4)Result [Test ON / Test OFF / Syst. OK / Syst. n.OK]

Measured value block 072: Basic setting
Activated charcoal shut-off valve
- Function 04 (Basic setting)
- Activate short trip
- Idle
- Wait for "Syst. OK" to appear in the 4th field.
1)Status of reed contact [text: Reed open / Reed closed]
2)Fault message [text: Small leak / Large leak / Abort]
3)Test status [- / Syst.test / Measurement / Meas.END]
4)Result [Test ON / Test OFF / Syst. OK / Syst. n.OK]

Measured value block 073:
Vacant

Measured value block 074:
Vacant

Measured value block 075: with temperature sensor Basic setting
Vacant

Measured value block 076: for pressure systems
Vacant

Measured value block 077: Basic setting
Vacant

Measured value block 078
Vacant

Measured value block 079Systems with exhaust gas flaps)
Exhaust flap valves
1)Engine speed [rpm]
2)Load [%]
3)Flap bank 1 [on/off]
4)Flap bank 2 [on/off]


Measured value block 080:
CU identification
1) Manufacturer works number and identifier
2) Date of manufacture
3) Manufacturer modification status
4) Manufacturer test status number
Manufacturer serial number

Measured value block 081:
CU identification
1) Chassis number
2) Module no./serial number
3) Type test number
4)

Measured value block 082:
CU identification
1)Flash tool code
2)Flash date
3)HW module/type
4)SW module/type

Measured value block 083:
CU identification
1)Original chassis number
2)
3)
4)

Measured value block 084
Vacant

Measured value block 085:
Vacant

Measured value block 086:
Ready and cycle bits
1)Ready bits (completed tests)
1= not completed
0= completed
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X Catalytic converter
X Heat.cat.
X ACF system
X SA system
X Air conditioner
X Lambda probes
X Lambda probe heating
X EGR
Specification:00000000
2)Cycle flags (completed cycles)
1= not completed
0= completed
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X Cat. bank 1
X Cat. bank 2
X LDP
X TBV
X Htg. B1-S1
X Htg. B1-S2
X Htg. B2-S1
X Htg. B2-S2
Specification:00000000
3)Cycle flags (completed cycles)
1= not completed
0= completed
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X B1-S1 el.
X B1-S2 el.
X B1-S1 (delta-lambda shift)
X B1-S2 (probe ageing)
X B1-S1 (period)
X SLS B1
X SLS B2
X B1-S1
Specification:00000000
4)Cycle flags (completed cycles)
1= not completed
0= completed
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X B2-S1 el.
X B2-S2 el.
X B2-S1 (delta-lambda shift)
X B2-S2 (probe ageing)
X B2-S1 (period)
X EGR B1
X EGR B2
X B2-S1
Specification:00000000

Measured value block 087:
Ready and error bits
1)Ready bits (completed tests)
1= not completed
0= completed
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X Catalytic converter
X Heat.cat.
X ACF system
X SA system
X Air conditioner
X Lambda probes
X Lambda probe heating
X EGR
Specification:00000000
2)Error flags
1= error
0= no error
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X Cat. bank 1
X Cat. bank 2
X LDP
X TBV
X Htg. B1-S1
X Htg. B1-S2
X Htg. B2-S1
X Htg. B2-S2
Specification:00000000
3)Error flags
1= error
0= no error
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X B1-S1 el.
X B1-S2 el.
X B1-S1 (delta-lambda shift)
X B1-S2 (probe ageing)
X B1-S1 (period)
X SLS B1
X SLS B2
X B1-S1
Specification:00000000
4)Error flags
1= error
0= no error
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X B2-S1 el.
X B2-S2 el.
X B2-S1 (delta-lambda shift)
X B2-S2 (probe ageing)
X B2-S1 (period)
X EGR B1
X EGR B2
X B2-S1
Specification:00000000

Measured value block 088:
Cycle flags for other onboard diagnoses
1)Cycle flags (completed cycles)
1= not completed
0= completed
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X Exhaust camshaft bank 2
X Exhaust camshaft bank 1
X Inlet camshaft bank 2
X Inlet camshaft bank 1
X Knock sensor 4
X Knock sensor 3
X Knock sensor 2
X Knock sensor 1
2)Cycle flags (completed cycles)
1= not completed
0= completed
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X Brake light switch
X Clutch switch
X Idling speed control
X Road speed signal
X Idling speed switch
X Coolant temperature sensor
X Throttle valve potentiometer
X Air mass meter
3)Cycle flags (completed cycles)
1= not completed
0= completed
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X Vacant
X Vacant
X Intake air
X Thermostat (USA only)
X Charge pressure control
X CCS control lever
X Lambda adaption B2
X Lambda adaption B1

Measured value block 089:
OBD
1))Kilometres driven with MIL [km] no readout for LEV
2)Tank level [OK/Too low]
3)
4)

Measured value block 090:
Vacant

Measured value block 091:
Continuous inlet camshaft adjustment, bank 1
1)Engine speed [rpm]
2)Duty cycle [%]
3)Adjustment specified [°CA] -14°CA...33°CA
4)Adjustment actual [°CA] -14°CA...33°CA


Measured value block 092:
Vacant

Measured value block 093: 2-bank systems
Inlet camshaft adjustment values
1)Engine speed [rpm]
2) Load [%]
3)Phase position bank 1 [°CA]
4)Vacant
The phase angle is the variation from the correct position (offset of Hall sender on shaft), 0 = position OK
The phase angle is only displayed if the phase adaption was completed successfully.

Measured value block 094: Basic setting
Continuous camshaft adjustment, inlet
- Function 04 (Basic setting)
- Activate short trip
- Press brake pedal and at same time press accelerator pedal down fully : Engine speed automatically adjusts to 2200 rpm -> "Test ON"
- Wait for "Syst. OK" to appear in fields 3 and 4.
1)Engine speed [rpm]
2)Adjustment actual [°CA]
3)Result bank 1 [Test on/ Test off/ Syst. OK/ Syst. n.OK]
4)Result bank 2 [Test on/ Test off/ Syst. OK/ Syst. n.OK]

Measured value block 095: Single-stage change-over
Vacant

Measured value block 096: Basic setting
Vacant

Measured value block 097:
Vacant

Measured value block 098
Vacant

Measured value block 099:
Lambda control shut-off (via basic setting)
(for sake of compatibility with old systems)
1)Engine speed [rpm]
2)Coolant temp. [°C]
3)Lambda controller [%]
4) lambda control [off/on]

Measured value block 100:
Readiness code (for sake of compatibility with old systems)
1)Ready bits (completed tests)
1= not completed
0= completed
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X Catalytic converters
X Heat.cat.
X ACF system
X SA system
X Air conditioner
X Lambda probes
X Lambda probe heating
X EGR
Specification:00000000
2)Coolant temp. [°C]
3)Time since engine start [s]
4)OBD status
(Meaning of 8-digit readout)
1 2 3 4 5 6 7 8
X No warm-up cycle detected
X Warm-up cycle detected
X Vacant
X Vacant
X At least 1 fault detected
X Trip complete
X Driving cycle recognised
X MIL on
1: Description met
0: Description not met

Measured value block 101: Systems with air mass metering
Injection
1)Engine speed [rpm]
2)Load [%]
3)Mean injection time [ms]
4)Air mass [g/s]

Measured value block 102:
Fuel injection
1)Engine speed [rpm]
2)Coolant temp. [°C]
3)Intake air temp. [°C]
4)Mean injection time [ms]

Measured value block 103:
Demand-regulated fuel pump
1)Actual fuel pressure [mbar] 3000-7000
2)I-controller fuel pressure [%/mbar]
3)Elec.fuel pump adaption value [%/mbar]
4)Fuel pump adaption [Test off/Adaption runs/Adaption OK/ERROR]

Measured value block 104:
Start adaption values
1)Starting engine temperature [°C]
2)Temperature adaption factor 1 [%]
3)Temperature adaption factor 2 [%]
4)Temperature adaption factor 3 [%]

Measured value block 105:
Vacant

Measured value block 106:
Fuel pressure
1)Fuel rail pressure [bar]
2)Electric fuel pump 1/2 [off / on or %PWM]
3) Vacant
4)Shut-off time [s]

Measured value block 107: for 1-bank systems Basic setting
Lambda control
- Function 04 (Basic setting)
- Activate short trip
- Idle
- Wait for "Syst. OK" to appear in the 4th field.
1)Engine speed [rpm]
2)Lambda controller bank 1 (averaged value) [%]
3) Vacant
4)Result text [ Test ON / Test OFF / Syst. OK / Syst. n.OK ]

Measured value block 108:
Vacant

Measured value block 109:
Vacant

Measured value block 110:
Load/full throttle enrichment
1)Engine speed [rpm]
2) Coolant temperature [°C]
3)Mean injection time [ms]
4)Throttle valve angle (potentiometer) [%]

Measured value block 111:
Charge pressure control
1)Adaption value ISS engine speed range 1 [%]
2)Adaption value ISS engine speed range 2 [%]
3)Adaption value ISS engine speed range 3 [%]
4)Adaption value ISS engine speed range 4 [%]

Measured value block 112: 1-bank system
Exhaust gas temperature
1)Exhaust gas temperature bank 1 [°C]
2)Enrichment factor sensor bank 1 [%]
3)Precalculated exhaust gas temperature[°C]
4)Modelled exhaust gas temperature[°C]

Measured value block 113:
Load/full throttle enrichment
1) Engine speed [rpm]
2) Load [%]
3)Throttle valve angle (potentiometer) [%]
4)Ambient pressure [mbar]

Measured value block 114:
Charge pressure control
1)Specified load without correction [%]
2)Specified load after correction [%]
3) Actual load [%]
4)Charge pressure valve duty cycle [%]

Measured value block 115:
Charge pressure control
1)Engine speed [rpm]
2) Load [%]
3) Specified charge pressure [mbar]
4) Actual charge pressure [mbar]

Measured value block 116:
Charge pressure control
1)Engine speed [rpm]
2) Correction factor, fuel [%]
3)Correction factor, coolant temp. [%]
4)Correction factor, intake air temp. [%]

Measured value block 117:
Charge pressure control
1)Engine speed [rpm]
2) Accelerator pedal position [%]
3)Throttle valve angle [%]
4) Specified charge pressure [mbar]

Measured value block 118:
Charge pressure control
1)Engine speed [rpm]
2) Intake air temperature [°C]
3)ISS valve duty cycle [%]
4) Charge pressure before throttle valve [mbar]

Measured value block 119:
Charge pressure control
1)Engine speed [rpm]
2)Current adaption value [%]
3)ISS valve duty cycle [%]
4) Charge pressure before throttle valve [mbar]

Measured value block 120:
TCS/FDR
1) Engine speed [rpm]
2)Specified torque TCS/FDR [Nm]
3)Engine torque [Nm]
4)Status [Text: TCS active/TCS n. active]

Measured value block 121:
Vacant

Measured value block 122:
Gearbox
1) Engine speed [rpm]
2)Specified torque Gearbox [Nm]
3)Engine torque [Nm]
4)Status [Text: Torque red/No red]

Measured value block 123:
Reserved for CAN bus messages

Measured value block 124:
Reserved for CAN bus messages

Measured value block 125:
CAN bus messages
1)Gearbox [fitting info]
- : No readout, if system not fitted, for
all CAN bus messages
Gear 0: No message yet received
Gear 1: Message received
2)ABS [fitting info]
ABS. 0
ABS. 1
3)Combi [fitting info]
Combi 0
Combi 1
4)AC [fitting info]
AC 0
AC 1

Measured value block 126:
CAN bus messages
1)Distance [fitting info]
Distance 0
Distance 1
2)Steering angle sender [fitting info]
St.ang. 0
St.ang. 1
3)Airbag [fitting info]
Airbag 0
Airbag 1
4)Elec. central electrics
Elec. CE 0
Elec. CE 1

Measured value block 127:
CAN bus messages
1)Four-wheel drive [fitting info]
4WD 0
4WD 1
2)Adaptive suspension [fitting info]
Level 0
Level 1
3)Steering wheel [fitting info]
Steering wheel 0
Steering wheel 1
4)Brake servo [fitting info]
Brake servo 0
Brake servo 1

Measured value block 128:
CAN bus messages
1)Electric ignition lock [fitting info]
El.ign. 0
El.ign. 1
2)NOx sensor 1 [fitting info]
NOx sensor1 0
NOx sensor1 1
3)NOx sensor2 [fitting info]
NOx sensor2 0
NOx sensor2 1
4) Engine CU/Slave CU
Engine 0 / Slave_1 0
Engine 1 / Slave_1 1

Measured value block 129:
CAN bus messages
1)Battery / Energy manager [fitting info]
E-Manag. 0
E-Manag. 1
2)Oil level sensor / ESI (TOG-Sensor) [fitting info]
Oil level 0
Oil level 1
3)Gateway [fitting info]
Gateway 0
Gateway 1
4) -

Measured value block 130: Basic setting
Map-controlled cooling
- Function 04 (Basic setting)
- Activate short trip
- Idle
- Wait for "Syst. OK" to appear in the 4th field.
1)Temperature engine outlet [°C]
2)Temperature radiator outlet [°C] only A3
3) Vacant
4) Vacant

Measured value block 131:
Map-controlled cooling
1)Temperature engine outlet [°C]
2) Vacant
3)Temperature radiator outlet [°C]
4) Vacant

Measured value block 132:
Vacant

Measured value block 133:
Vacant

Measured value block 134:
Temperatures
1) Oil temperature [°C]
2)Ambient temperature [°C]
3) Intake air temperature [°C]
4) Engine outlet temperature [°C]

Measured value block 135:
Fan control
1)Radiator outlet temperature [°C]
2)Duty cycle fan actuator 1 [%]
3)Duty cycle fan actuator 2 [%]
4)Radiator fan drive circuit temperature [°C]

Measured value block 136:
Fan activation relays
1)Vacant]
2)Vacant
3)Additional water pump [pump OFF/pump ON]
4)Fan run-on [on/off]

Measured value block 137:
Air conditioner requests
1)AC inlet [on/off]
2)Compressor [on/off]
3)High pressure switch / pressure from air conditioner [on/off / bar]
4)Fan request from air conditioner [%]

Measured value block 138:
Thermostat diagnosis
1)Engine start temperature [°C]
2)Mean engine air mass [g/s]
3)Mean vehicle speed [km/h]
4)Result [Text: Test ON / Test OFF / Syst. OK / Syst. n.OK / Abort]

Measured value block 139:
Thermostat diagnosis
1)Engine temperature in diagnosis [°C]
2)Actual air mass integral [kg]
3)Specified air mass integral [kg]
4)Result [Text: Test ON / Test OFF / Syst. OK / Syst. n.OK / Abort]

Measured value block 140: Hitachi
Fuel quantity control valve
1) Fuel quantity control valve closing angle [°CA]
2) Fuel quantity control valve opening angle [°CA]
3)Rail pressure actual [bar]
4)Status
(Meaning of 8-digit number block)
1 2 3 4 5 6 7 8
X 1 = active / 0 = not active
X Vacant
X Vacant
X Vacant
X Vacant
X Vacant
X Vacant
X Vacant

Measured value block 141: Hitachi
Fuel supply system
1)High pressure system adaption [bar]
2)Controller component [mm3]
3)Total compression volume [mm3]
4)Rail pressure (actual) [bar]

Measured value block 142: Continuous adjustment Basic setting
Charge motion flap for BDE
- Function 04 (Basic setting)
- Activate short trip
- Idle
- Wait for "Syst. OK" to appear in the 4th field.
1)Voltage upper limit [V]
2)Voltage lower limit [V]
3)Adaption status [n]
4)Adaption status [ADP runs / ADP OK / ERROR]

Measured value block 143: Continuous adjustment
Charge motion flap for BDE
1)Engine speed [rpm]
2) Load [%]
3)Charge motion flap opening angle [%]
4)BDE mode
(Meaning of 8-digit number block)
1 2 3 4 5 6 7 8
X Homogeneous
X Homogeneous lean
X Homogeneous stratified dual injection
X Stratified
X Stratified cat heating dual injection
X Vacant
X Vacant
X With bit 0 homogeneous knock protection

Measured value block 144: Basic setting
Vacant
Measured value block 145: Basic setting
Vacant

Measured value block 146: Basic setting
Vacant

Measured value block 147: Basic setting
Vacant

Measured value block 148: Basic setting
Desulphurisation NOx storage-type catalytic converter bank 1
Vacant

Measured value block 149: Basic setting
Vacant

Measured value block 150:
Vacant

Measured value block 151:
Vacant

Measured value block 152:
Vacant

Measured value block 153:
Vacant

Measured value block 154:
Vacant

Measured value block 155:
Vacant

Measured value block 156:
Vacant

Measured value block 157:
Vacant

Measured value block 158:
Vacant

Measured value block 159:
Vacant

Measured value block 160:
Vacant

Measured value block 161:
Vacant

Measured value block 162: Basic setting
Vacant

Measured value block 163: Basic setting
Vacant

Measured value block 164:
Vacant

Measured value block 165:
Continuous control after main cat., bank 1
Vacant

Measured value block 166:
Lambda probes plausibility, bank 1
1)Lambda actual []
2)Probe voltage after cat. [V]
3)Integral air mass [g/s]
4)Result [Test on/Test off/B1-S1 OK/B1-S1 n.OK]

Measured value block 167: Basic setting
Lambda probe overrun compensation
- Function 04 (Basic setting)
- Activate short trip
- Idle
- Wait for "Syst. OK" to appear in the 4th field.
1)Oxygen content [%]
2)Diagnostic overrun counter []
3)Steady lambda probe correction value characteristic [%]
4))Result [Test ON / Test OFF /Activated/ADP runs/Syst. OK/Syst. n.OK]

Measured value block 168: Basic setting
Vacant

Measured value block 169:
Vacant

Measured value block 170 -200:
Vacant

[sergioiacobucci]

goto mvb's for lambda then spray a cleaning agent like brake cleaner around all the breather pipes

You have to much air or insufficient fuel

watch the mvb voltage on the lambda

if it goes mad then you have found the leak

the large circular pcv valve on the rocker next to your coolant pipe is a common fault

the valve flap breaks away inside, remove the unit and suck on the pipe to see if the flap works

acf valve or pipe blocked another and the good old air filter but in your photo you have a missing part off the air filter?

mvbs


Unified measured value blocks - petrol engines
2.0L T-FSI version 1.24

Wow thanks for all the info, unfortunately I only have a cheap eBay cable and a registered version of VCDS lite and it doesn't connect to the engine when I try the addresses. Thats why we got it scanned at a garage, so I dont think I'll be able to check using the MVB method. When the engine is turned off there is a loud hissing noise coming from the pcv valve you mentioned does that mean anything?

And yes I took the air box thingy off just to have a look

Again thank you very much!

[a8 tech]

could be, just take it off and suck on the pipe to see if the flap moves

[sergioiacobucci]

could be, just take it off and suck on the pipe to see if the flap moves

Great thanks - ok I'll do that in the daylight tomorrow. I was just reading up on it and read it can hiss if its clogged so maybe I'll give it a clean since I got it off tomorrow and see if that helps, is it normal for it to hiss when I turn the engine off?

[audi di fixit?]

Put some washing up liquid and water in a squirty bottle and spray it systematically on your pipes. Get someone else to give it a few revs. If theres a leak, it will bubble up.

[Crasher]

It's an old thread you have replied to but I have to ask, how would a vacuum leak cause bubbles?

[zollaf]

bubbles on the inside of the pipe silly...

[Crasher]

Ahh, time to break out my new X Ray specs...

[audi di fixit?]

leak.jpg

The same principle applies to any component suspected of leaking air. Be it a vacuum line leak, valve, intercooler etc.....