P2A04

P2A04

Diagnosis information - Control unit DME (DFI)

Mixture Behind catalytic converter Bank 1 - Signal too lean / too rich

NOTE:
Separated plug connection = open reference-air duct.
Damage to oxygen sensor.

- DO NOT use spray, grease, fluid or similar products on the oxygen sensor plug connections.

INFORMATION
- Do not interchange the oxygen sensor in front of the catalytic converter with the sensor behind the catalytic converter as this will result in implausible fault entries.
- The plugs themselves are coded and cannot be interchanged.

Diagnostic conditions
- Engine running > 90 Second(s) , at:
- without Overrun phase(s)
- All models: Oxygen sensor(s) ready for operation

Possible fault causes
- Fault Fuel/air mixture preparation
- Fault Exhaust line
- Fault Emissions measurement

Fault setting condition(s)
- The oxygen sensor signal deviates by a certain value from the control value (rich/lean mixture) within a certain time.

Fault effects
- Since oxygen sensing is interrupted the moment a fault is detected, the DME (DFI) control unit stores this fault as information.
- Other faults have been entered
- The vehicle must be driven in the same driving cycle (without ignition reset) for this purpose.