P2A03

P2A03

Electric fault in oxygen sensor ahead of catalytic converter, bank 2

Diagnostic conditions
- Battery voltage between 11 V and 16 V
- Engine running
- Exhaust temperature > 100 °C
- Oxygen sensor ahead of catalytic converter operational
- No inertia fuel shutoff

Possible cause of fault
- Other electric oxygen sensor faults are stored in the fault memory

Affected pins
-

Diagnosis/troubleshooting

NOTE:
- This fault indicates that the DME has detected an implausible temperature range for the oxygen sensor.
- Since oxygen sensing is interrupted at this time, the DME stores this fault as information. The exact cause of the fault is stored as an additional P code.

NOTE:
- Do not use contact spray on the oxygen sensor plug connections, as this may cause irreparable damage to the wiring (blocking the reference air channels).
- Do not confuse oxygen sensor ahead of catalytic converter and oxygen sensor behind catalytic converter as this will cause implausible fault entries.

Distinguishing feature of both sensors:

Oxygen sensor ahead of catalytic converter (LSU) has a six-pin connector






Oxygen sensor behind catalytic converter (LSF) has a four-pin connector