P0101 MAF range performance

[Muckie1]

Hi everyone.
I have an Audi A1 sport 2012 1.6tdi. 103k
Great car bought from new, recently serviced by Audi specialists.
Noticed the next day that the coil lamp started flashing and eventually the engine light came on.
No noticeable difference in performance, other than Stop Start doesn't work in this condition.

I attached my VAG II and got the following codes.

P0101 Mass or Volume Airflow A circuit range performance
P0111 Intake Air Temperature Sensor 1 circuit range/performance.

I removed the MAF sensor and cleaned it using MAF cleaner, thinking that maybe the change of air filter at the service may have dirtied it.
Seemed ok for 60 miles then came on again, same codes. I decided to change the MAF for new as I have 100K+.Seemed ok again for 60 miles and it came on again.

Now I have checked the connections, wiring as best I can, connector and terminals are locked and clean, can't see or hear any air leaks in the air intake so I'm puzzled.

Being a cynic I wondered if the garage that serviced it, did something to get more work, or maybe the fluffy looking air filter is causing a problem.

One thing I did wonder having read somewhere, the Brake switch is somehow connected to the MAF electrically? today it was ok for 32 miles on my motorway drive as soon as I needed to hit the brakes at speed to slow down the light came on. Now this may be coincidence, but I am wondering if there's something in it. Or could it be the sudden reduction in airflow causing that?

Anyone else found these codes and resolved them?

[arman123]

You need to scan it using VCDS to get a accurate fault code read out most likely it a sensor to with the exhaust or DPF

[Muckie1]

You need to scan it using VCDS to get a accurate fault code read out most likely it a sensor to with the exhaust or DPF

Hi Thanks for the reply, my VAG ii doesn't give enough information, I know someone with VCDS, will take a look.

The light was off this morning , I needed to brake sharply on the motorway after 6 miles and it came on, together with the Engine light.

There's no noticeable effect on the drive.

[Muckie1]

In addition, I just put the VAG ii on and the air inlet temperature seems fixed on 130°C, even when the engine is cold.
Didn't notice that previously as the engine was warm after a run.
It was 130°C then too.

I'll check it tomorrow with VCDS and see what it reads. But any thoughts on that ?

[Muckie1]

Ok this is what I see on the VCDS.


01-Engine -- Status: Malfunction 0010
03-ABS Brakes -- Status: OK 0000
04-Steering Angle -- Status: OK 0000
08-Auto HVAC -- Status: OK 0000
09-Cent. Elect. -- Status: Malfunction 0010
10-Park/Steer Assist -- Status: OK 0000
15-Airbags -- Status: OK 0000
16-Steering wheel -- Status: OK 0000
17-Instruments -- Status: Malfunction 0010
19-CAN Gateway -- Status: OK 0000
25-Immobilizer -- Status: OK 0000
42-Door Elect, Driver -- Status: OK 0000
44-Steering Assist -- Status: OK 0000
46-Central Conv. -- Status: OK 0000
52-Door Elect, Pass. -- Status: OK 0000
5F-Information Electr. -- Status: OK 0000

-------------------------------------------------------------------------------
Address 01: Engine (J623-CAYC) Labels:. 03L-906-023-CAY.clb
Part No SW: 03L 906 023 KQ HW: 03L 906 023 KP
Component: R4 1.6l TDI H63 9978
Revision: --H63--- Serial number:
Coding: 00114036032501080000
Shop #: WSC 00046 790 00000
ASAM Dataset: EV_ECM16TDI02103L906023KQ 003015
ROD: EV_ECM16TDI02103L906023KG.rod
VCID: 7F069776E60555BC61-802A
3 Faults Found:
7330 - Mass Air Flow Sensor (G70)
P0101 00 [101] - Implausible Signal
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 166302 km
Date: 2018.05.18
Time: 08:35:08
Engine speed: 1702.25 /min
Normed load value: 0.0 %
Vehicle speed: 91 km/h
Coolant temperature: 87 °C
Intake air temperature: 130 °C
Ambient air pressure: 1010 mbar
Voltage terminal 30: 14.569 V
Unlearning counter according OBD: 40
Air mass: actual value (mg/stroke)-MAF_MES: 513.698 mg/stroke
Air mass proportion filtered-FAC_MAF_CYL_KGH_RATIO_FIL: 0.77930
EGR Solen.val.: actual value-ANG_EGRV[0]: 0.000 %
Throttle valve adapter: actual value-ANG_THR[0]: 95.996 %
Charge air pressure specified value-MAP_SP_MMV: 1248.07 hPa
Charge air pressure: actual value-MAP_MMV: 1248.07 hPa
Engine torque-TQI_SP: 0.00 Nm
7307 - Intake Air Temp. Sensor (G42)
P0112 00 [032] - Signal too Low
Intermittent - Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 18
Mileage: 166235 km
Date: 2018.05.17
Time: 12:32:24
Engine speed: 0.00 /min
Normed load value: 0.0 %
Vehicle speed: 0 km/h
Coolant temperature: 48 °C
Intake air temperature: 130 °C
Ambient air pressure: 1020 mbar
Voltage terminal 30: 12.085 V
Unlearning counter according OBD: 39
Engine speed: 1270 /min
Vehicle speed: 52 km/h
Outside air temperature-Ambient temperature: 18.75 °C
Battery voltage: 14.7 V
Battery voltage: 14.7 V
Battery voltage: 14.7 V
Battery voltage: 14.7 V
13281 - Intake Air Temp. Sensor (G42)
P0111 00 [101] - Implausible Signal
Not Confirmed - Tested Since Memory Clear
Freeze Frame:
Fault Status: 00000001
Fault Priority: 2
Fault Frequency: 1
Mileage: 166290 km
Date: 2018.05.18
Time: 08:20:57
Engine speed: 0.00 /min
Normed load value: 0.0 %
Vehicle speed: 0 km/h
Coolant temperature: 12 °C
Intake air temperature: 98 °C
Ambient air pressure: 1010 mbar
Voltage terminal 30: 11.520 V
Unlearning counter according OBD: 40
Coolant temperature: 12 °C
Coolant temperature at radiator outlet: actual value-TCO_2: 10 °C
Fuel temperature-TFU: 13 °C
Sensor for temp after charge air cooler: raw value-TBA_MES: 98 °C
Outside air temperature-Ambient temperature: 10.50 °C
Shut-off timer: last ECM after-run time-T_ES_FCT_DIAG: 0.00 s
Time since engine start: 0 s


Address 09: Cent. Elect. (J519) Labels:. 8X0-907-063.clb
Part No SW: 8X0 907 063 G HW: 8X0 907 063 G
Component: BCM PQ35 M 110 0655
Revision: 00110 AE
Coding: 0E000A2CA805F100201841E00100015443FB6C0A00EF4122DC 0087830041
Shop #: WSC 00046 000 00000
VCID: 4084D48AD37BEA4458-8014
Subsystem 1 - Part No SW: 8K0 955 559 HW: 8K0 955 559
Component: RLS H04 0003
Serial number: 20050778
Coding: 02562D
Subsystem 2 - Part No: 8X0 951 177
Component: DWA-Sensor H0 H01 0020
Subsystem 3 - Part No: 1K0 951 605 C
Component: LIN BACKUP HO H05 1501
1 Fault Found:
00332 - Control Circuit for Tank Flap
007 - Short to Ground
Freeze Frame:
Fault Status: 01100111
Fault Priority: 4
Fault Frequency: 18
Reset counter: 45
Mileage: 164371 km
Time Indication: 0
Date: 2018.04.12
Time: 09:09:07
Freeze Frame:
Term 15 Off
Voltage: 12.45 V
OFF
ON
Term 50 Off
OFF
OFF

[Muckie1]

Digging a bit more,
3 Wires are on the sensor socket.
Right pin (not numbered) 5V supply to the Sensor is fine.
Left pin is ground
centre pin has very low resistance (to ground), I don't know what it should be but I suspect this is the reason the temp sensor is reading 130C.

I'm guessing this goes into the control unit.
So unless there's something in the cables?
I don't have a tracker to chase the short unfortunately.
Looks like one for the garage now.

[Muckie1]

Anyone?

[Muckie1]

Its fixed.
That was interesting.
Let me know if anyone is interested and Ill post the details

[Leoncj]

Hey muckie, i have exactly the same problem, i have tried smoke testing all the vaccum pipes and checking the MAF sensor but no luck, did you find the fix?

[Muckie1]

Hi Leoncj,
If you look in my VCDS above, you will see the Intake air temperature measures 130 °C.
This is clearly incorrect.
Does yours have the same reading?

[Matt222]

Hi Muckie1,

Was this issue with the wiring loom or was it with the IAT sensor? I've got a similar problem on my car. i.e I get a P0101 with a flashing emission coil when I break hard, however I don't get any performance issues and the coil light goes off if I restart the car. I've had some loom issues in the passed and wondered if you could shed some light on your fix?

Thnx

[Muckie1]

Hi Matt,
Same symptoms by the sound of it.
Did you run VCDS on it?
Take a look at mine earlier in the thread, I had IAT at 130C, do you have this too?

Let me know what IAT temp is, that is key.
Also, out of interest does your fuel cap lock work? Lock the car and push open the fuel cap cover.
Let me know what you get.

Cheers

[Matt222]

Hi Muckie,

I recently had a different issue with my IAT so I changed the IAT and the AMM in the car. It fixed the issue I was having but it seems to have introduced the P0101 issue. I haven't scanned my car yet but i'll do it some point this week.

What was your fix in your instance?

I checked my fuel cap and it works as expected.

[Muckie1]

Hi Matt,
I think P0101 covers a multitude of sins.
I changed the IAT/ Mass airflow sensor but it didn't fix my problem, anyway its new so I don't have to worry about it again.
The IAT temp at 130C was the clue, open circuit it is very low, short circuit it is high.
We removed the plug from the boost pressure sensor and the 130C reduced.
So changed it, that cured the problem once the fault codes were reset.
It also fixed the faulty fuel cap problem which was indicating a short circuit. And wouldn't lock.

Weird fault, Boost pressure sensor cost £30 but seems ok now

Let me know where you get and if you fix it.

Cheers

[Matt222]

Thanks Muckie1,

I just scanned my car and the IAT was fine for most of the journey, but it did drop to -40 once. hmmmmm....This feels like a loom issue.

[Muckie1]

Thanks Muckie1,

I just scanned my car and the IAT was fine for most of the journey, but it did drop to -40 once. hmmmmm....This feels like a loom issue.

Looks like that’s the problem, could be connectors or cables,
Good luck

[bebetositu]

Its fixed.
That was interesting.
Let me know if anyone is interested and Ill post the details

Hi, I have exactly the same problems, both the Mass airflow sensor and the Air Temp sensor changed, codes come back, please could you let me know how you fixed it? Thanks

[Muckie1]

Hi,
Did you run VCDS on it?
Take a look at mine earlier in the thread, I had IAT at 130C, do you have this too ?

I think P0101 covers a multitude of sins.
I changed the IAT/ Mass airflow sensor but it didn't fix my problem, anyway its new so I don't have to worry about it again.
The IAT temp at 130C was the clue, open circuit it is very low, short circuit it is high.
We removed the plug from the boost pressure sensor and the 130C reduced.
So changed it, that cured the problem once the fault codes were reset.
It also fixed the faulty fuel cap problem which was indicating a short circuit. And wouldn't lock.

Weird fault, Boost pressure sensor cost £30 but seems ok now

[bebetositu]

OK, so change the Boost pressure sensor, I will try this, thanks.

[Muckie1]

OK, so change the Boost pressure sensor, I will try this, thanks.

Be interested to know if yours is the same problem

[bebetositu]

Be interested to know if yours is the same problem
Hi, just spoken to my mechanic, he said no issue with the pressure sensor, and the IAT temperature was ok as he remembered, his guess would be the wires or the ECU fault, he referred me to an auto electrician.

[bebetositu]

Hi,
Did you run VCDS on it?
Take a look at mine earlier in the thread, I had IAT at 130C, do you have this too ?

I think P0101 covers a multitude of sins.
I changed the IAT/ Mass airflow sensor but it didn't fix my problem, anyway its new so I don't have to worry about it again.
The IAT temp at 130C was the clue, open circuit it is very low, short circuit it is high.
We removed the plug from the boost pressure sensor and the 130C reduced.
So changed it, that cured the problem once the fault codes were reset.
It also fixed the faulty fuel cap problem which was indicating a short circuit. And wouldn't lock.

Weird fault, Boost pressure sensor cost £30 but seems ok now

Hi Muckie1, the light not coming back anymore after you changed the Boost pressure sensor since June?

[Muckie1]

Hi Muckie1, the light not coming back anymore after you changed the Boost pressure sensor since June?

No light. All seems well.
After changing the BPS the inlet air temp was operating correctly and not stuck on 130C

[bebetositu]

No light. All seems well.
After changing the BPS the inlet air temp was operating correctly and not stuck on 130C


Where did you buy your BPS? Also, does your Mass air flow sensor have the Continental logo on it? please see photo:

I have been to my local garage quite a few times, they changed the MAF sensor and the IAT sensor, I only have the P0101 code left after both sensor changed, please see photo, I also have a mobile electrician visited twice, he checked the wires, but still no luck, he said he has ran the VCDS and the IAT is showed regular temperature, he still can not find the fault. I may still suggest them to change the BPS?

35508

35509

[Muckie1]

The MAF is the same continental type as your picture.
The BPS came from my garage supplier.
I don’t think the BPS is too expensive, around £30, I’ve heard all sorts of weird problems happening, the BPS caused my fuel filler lock to show short circuit on the VCDS. No harm swapping it I guess, at least you will know whether it is that or not.

[bebetositu]

The MAF is the same continental type as your picture.
The BPS came from my garage supplier.
I don’t think the BPS is too expensive, around £30, I’ve heard all sorts of weird problems happening, the BPS caused my fuel filler lock to show short circuit on the VCDS. No harm swapping it I guess, at least you will know whether it is that or not.

Ok, the BPS is cheap, I am going to ask my local garage to change it to see if I will have any luck. Thanks

[bebetositu]

The MAF is the same continental type as your picture.
The BPS came from my garage supplier.
I don’t think the BPS is too expensive, around £30, I’ve heard all sorts of weird problems happening, the BPS caused my fuel filler lock to show short circuit on the VCDS. No harm swapping it I guess, at least you will know whether it is that or not.

Hi Muckie1, someone also suggested it might be the EGR Valve, see link belows, do you think it would worth a try on this after the BPS?

P0101 error, black smoke, holds back - AudiForums.com (https://www.audiforums.com/forum/audi-a6-9/p0101-error-black-smoke-holds-back-190857/)

[Muckie1]

I considered the EGR valve for mine, I concluded it probably wasn't that as I had no difference in driving and I suspected that if the EGR valve was faulty I would notice in the way the car handled.
But who knows ?? This system is weird.
If you are at the point of swapping parts and hoping it fixes it, I'd go for the cheapest thing first.

[bebetositu]

I considered the EGR valve for mine, I concluded it probably wasn't that as I had no difference in driving and I suspected that if the EGR valve was faulty I would notice in the way the car handled.
But who knows ?? This system is weird.
If you are at the point of swapping parts and hoping it fixes it, I'd go for the cheapest thing first.

I don't see any difference in driving too, no black smoke from the exhaust, brake lights working fine, fuel cap lock working fine, I am going to change the BPS this afternoon, I will see how it goes.

[bebetositu]

I went to the garage again to change the boost pressure sensor on Friday, but the guy told me that the IAT temp was at 130 C before changing the IAT sensor and the temp drop to normal after the IAT sensor changed, he ran a scan for me and shown me the temp was good, around 19 C something, all other data showing fine, can not see any problems with the car, only the P0101 code still there, so he said is no need to waste more money to change the pressure sensor, sensor returned. I am having a ECU remapping guy to come for a visit today, he will run a diagnostic, there might be a fault in the ECU, hope he could find it.

[Muckie1]

I went to the garage again to change the boost pressure sensor on Friday, but the guy told me that the IAT temp was at 130 C before changing the IAT sensor and the temp drop to normal after the IAT sensor changed, he ran a scan for me and shown me the temp was good, around 19 C something, all other data showing fine, can not see any problems with the car, only the P0101 code still there, so he said is no need to waste more money to change the pressure sensor, sensor returned. I am having a ECU remapping guy to come for a visit today, he will run a diagnostic, there might be a fault in the ECU, hope he could find it.

The IAT sensor is part of the MAF sensor, if that cured the temperature issue then you probably have 2 faults. Unless the original fault wasn’t cleared in the log of course. But I’m sure that’s not the case.
Hopefully the ECU guy can spot something.
Let me know how it goes.

[bebetositu]

The IAT sensor is part of the MAF sensor, if that cured the temperature issue then you probably have 2 faults. Unless the original fault wasn’t cleared in the log of course. But I’m sure that’s not the case.
Hopefully the ECU guy can spot something.
Let me know how it goes.

The ECU remapping guy came yesterday morning, he updated the ECU and cleared the code off the ECU, he said all the parts working fine in the car, just need to update the ECU and clear code using the Remapping tool, which the garage and auto electrician don't have this kind of tool, I have done a 30 miles motorway last night and another 30 miles this morning, so far no lights, I think he might have solved the problem. I think perhaps the ECU of the A1 is very sensitive, it needs to be updated after new sensors fitted, but anyway, I am happy the problem has been solved, I will give it 2 more days to monitor the light, hopefully I don't need to do anything any more.

[Muckie1]

So the Garage wasn't able to clear the codes?

In that case the fault was the MAF/IAT sensor as the 130C disappeared when it was changed.
Sounds like a result !

When you say he updated the ECU what did he update it to?


Hope it stays fixed.

[damianojol]

[QUOTE=Muckie1;1091012]Hi Matt,
Same symptoms by the sound of it.
Did you run VCDS on it?
Take a look at mine earlier in the thread, I had IAT at 130C, do you have this too?

Let me know what IAT temp is, that is key.
Also, out of interest does your fuel cap lock work? Lock the car and push open the fuel cap cover.
Let me know what you get.

To Mackie1
Hi I’m suffering with the same problem . Just wondering why have you asked a question about fuel cap locking?? Is it related to issue wit bad maf senor?? Thank you very much

[Muckie1]

Do you have a faulty MAF?

It was really strange, VCDS was showing the fuel cap lock as a short circuit to ground.
It may have been a coincidence, but when the Boost pressure sensor was changed the fuel cap lock was also fixed and has been ok ever since.

VCDS showed the following

1 Fault Found:
00332 - Control Circuit for Tank Flap
007 - Short to Ground

[subparts]

Hi Muckie i have the same problem with my daughters 2014 a1 1.6 diesel any help would be appreciated

[Muckie1]

Hi Muckie i have the same problem with my daughters 2014 a1 1.6 diesel any help would be appreciated
Have you run VCDS? What codes do you see?

[couttsie1]

Hello Muckie I am having very similar problems with a 2014 Caddy 2.0l !! Can you tell me what was your fault in the end and how you fixed it
Regards
Couttsie1

[Muckie1]

Hello Muckie I am having very similar problems with a 2014 Caddy 2.0l !! Can you tell me what was your fault in the end and how you fixed it
Regards
Couttsie1

similar? What exactly?
what does VCDS show.
Boost pressure sensor was faulty, but there were odd symptoms along the way.
Have a look at thread.