1.4 tsi boost problems limp mode

[deutsch]

i have a 200 golf gt 1.4 tsi (supercharger & turbo), its causing some problems, it started with these fault codes


Address 01: Engine Labels: 03C-906-032-BLG.lbl
Control Module Part Number: 03C 906 032 A HW: 03C 906 032
Component and/or Version: MED17.5.1 9971
Software Coding: 0000072
Work Shop Code: WSC 00442 210 91419
VCID: 1B3E003BA33E
2 Faults Found:
008801 - Boost Pressure Control Valve (N249): Mechanical Malfunction
P2261 - 000 - - - Intermittent
Freeze Frame:
Fault Status: 00110000
Fault Priority: 0
Fault Frequency: 1
Mileage: 58824 km
Time Indication: 0
Date: 2000.00.00
Time: 16:04:25
Freeze Frame:
RPM: 2590 /min
Load: 26.7 %
Speed: 61.0 km/h
Temperature: 85.0°C
Temperature: 16.0°C
Absolute Pres.: 970.0 mbar
Voltage: 13.970 V
004261 - Position Sensor for Intake Air Regulating Flap: Signal too High
P10A5 - 000 - - - Intermittent
Freeze Frame:
Fault Status: 00100000
Fault Priority: 0
Fault Frequency: 1
Mileage: 58824 km
Time Indication: 0
Date: 2000.00.00
Time: 16:04:21
Freeze Frame:
RPM: 2737 /min
Load: 90.6 %
Speed: 53.0 km/h
Temperature: 85.0°C
Temperature: 18.0°C
Absolute Pres.: 970.0 mbar
Voltage: 13.589 V

i have cleared the boost pressure control valve (n249) fault by changing the valve on the turbo (part number 03c 145 710 d)
i am now left with just this
Address 01: Engine Labels: 03C-906-032-BLG.lbl
Control Module Part Number: 03C 906 032 A HW: 03C 906 032
Component and/or Version: MED17.5.1 9971
Software Coding: 0000072
Work Shop Code: WSC 00442 210 91419
VCID: 1B3E003BDABEE1B
1 Fault Found:
004261 - Position Sensor for Intake Air Regulating Flap
P10A5 - 000 - Signal too High - MIL ON
Freeze Frame:
Fault Status: 11100000
Fault Priority: 0
Fault Frequency: 1
Mileage: 58883 km
Time Indication: 0
Date: 2000.00.00
Time: 15:20:00
Freeze Frame:
RPM: 2672 /min
Load: 61.5 %
Speed: 52.0 km/h
Temperature: 85.0°C
Temperature: 10.0°C
Absolute Pres.: 990.0 mb
also when driving hard i have noticed that the boost gauge will go to full boost until the revs reach about 3500rpm then they drop back to only half boost for the rest of the rev range. when back below 3000rpm the boost goes back to full.

please does any one have any ideas ?????

thanks in advance

[Pit Dweller]

Did you get any where with this? My suggestion would be to replace N75

[deutsch]

I have now tried, pcv, n75, and the Flap with the position sensor fault (sorry can't remember the name, the silver one towards the rear of the engine). Still getting problems. Think it's time to start looking at turbo and charger now.

Do you have similar problem??

[Pit Dweller]

Can that fault be erased? or is it permantly logged?

[deutsch]

Sometimes not but mostly can be erased

[Pit Dweller]

Will have a think about this one. 'Signal too high' can sometimes mean a poor connection in wiring. Not saying it is definatly that, but had a 'boost pressure sensor, signal too high' fault on a scirocco and it was partially broken wiring at the connector. Worth checking the wiring out.