P2097

2A2C - P2097

Information saved in
DME

Fault code
2A2C - P2097

Fault text
Oxygen sensor before catalytic converter, air-fuel mixture
fine control

Fault description
Pre-catalyst oxygen sensor, precision mixture control

Condition for fault identification
Test condition:
Post-catalyst control active,
no diagnostic trouble codes logged indicating a mixture
fault, value of
post-cat control dlatrmo_w > 1.0
Terminal condition: none
Voltage condition:
none

Condition for fault memory entry
offset recognition is active > 60 sec.

Action in service
- If faults related to mixture control are present repair these
first
- Conduct system test for oxygen sensors in wrong mutual
positions
- Check muffler unit before oxygen sensor behind catalytic
converter for leaks
- Check wiring harness between oxygen sensor and DME
- Replace pre-catalyst oxygen sensor
- Replace oxygen sensor behind catalytic converter
- Replace DME

Fault effect and breakdown warning
None
MIL lights up when fault is detected in two consecutive
driving cycles

Driver information
Warning light:
MIL ON (US only)

Service instruction
None