P0127
P0127Intake air temperature sensor - over limit value
Diagnostic conditions
- Battery positive voltage between 10 V and 16 V
- Vehicle speed over 35 km/h
- Intake mass air flow 20-100 kg/h
- No relevant fault (vehicle speed)
Possible cause of fault
- Intake air temperature sensor faulty (short circuit or contact resistances)
Affected terminals
Turbo : DME control module connector B, pin 108, and boost pressure sensor connector, pin 1
Turbo : DME control module connector A, pin 26, and boost pressure sensor connector, pin 2
Naturally aspirated engine : DME control module plug A, pin 26, and pin 1 of MAF sensor plug
Naturally aspirated engine : DME control module plug A, pin 27, and pin 3 of MAF sensor plug
Diagnosis/troubleshooting
MAF sensor
Boost-pressure sensor
NOTE:
- In the case of the turbo engine, the intake air temperature sensor is integrated into the boost pressure sensor.
- In the naturally aspirated engine, the intake air temperature sensor is integrated into the MAF sensor 1 (as shown).
NOTE:
- Naturally aspirated engines only: In Step 4, the MAF sensor must not be removed, but only replaced complete with the tubular piece.
- A diagonal exchange is possible because both the MAF sensors (including tubular piece) are identical, but the intake air temperature sensor is only used on the right (as shown).
