DME 7.8

P1134

419 Oxygen Sensing Error By Means Of Short Test, Bank 2 - 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

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.







419 Oxygen Sensing Error by means of Short Test, Bank 2 - 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

Diagnosis/troubleshooting

NOTE: Air leaks ahead of the oxygen sensors can lead to a fault in adaptation. Check exhaust system for leaks.