DME 7.8
P1127Oxygen Sensing Error by means of Short Test, Bank 1 - Below Limit
Diagnosis conditions
- Mixture adaptation performed with the Porsche System Tester 2
Possible fault cause
- Incorrect signal from MAF sensor
- Fuel pressure too high
- Fuel injector leaking
- EVAP canister purge valve open
Affected terminals
-
Diagnosis/troubleshooting
NOTE: If DTC P0445 (fuel tank vent valve - short to ground) is stored, correct this fault first. An open EVAP canister purge valve can lead to the lean threshold being reached.
Oxygen Sensing Error by means of Short Test, Bank 1 - Above Limit
Diagnosis conditions
- Mixture adaptation performed with the Porsche System Tester 2
Possible fault cause
- Incorrect signal from MAF sensor
- Intake air system leaking
- Fuel pressure too low
- Volume supply of fuel pump too low
- Fuel injectors fouled
Affected terminals
-
Diagnosis/troubleshooting
NOTE: Air leaks ahead of the oxygen sensors can lead to a fault in adaptation -->Check exhaust system for leaks.
