273A - P2270 (DME)

273A - P2270

Information saved in
DME

Fault code
273A - P2270

Fault text
Oxygen sensor vibration check behind catalytic converter,
bank 1

Fault description
O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 2)

Condition for fault identification
Test condition:
Trim control suspicion with observation of P component and
I component laeds to guided RICH control;
if the post-cat oxygen sensor signal fails to respond
accordingly, the error is assigned to the post-cat oxygen
sensor
Terminal condition: Engine running
Voltage condition:
none

Condition for fault memory entry
After K_LAVK_OBD_ACT_NK_F_CNT (1x) RICH
control events the oxygen sensor sticks at LEAN

Action in service
1. Check exhaust system for leaks
2. If OK, replace post-cat oxygen sensor LSNK B1

Fault effect and breakdown warning
MIL on after engine runs 2x / no effects on drivability

Driver information
Warning light:
MIL

Service instruction
none