P0041

2C6A - P0041

Information saved in
DME

Fault code
2C6A - P0041

Fault text
Oxygen sensors behind catalytic converter, mixed up

Fault description
O2 Sensor Signals Swapped Bank 1 Sensor 2 / Bank 2
Sensor 2

Condition for fault identification
Test condition:
O2 sensor system check
O2 sensor voltage too low = Signal sticks at lean on one
bank and O2 sensor voltage too high = Signal sticks on rich
on the other bank
The trim controller diagnosis must have been executed, see
trim controller diagnosis. Detection of faults during the trim
control diagnosis triggers the active test. Engine running at
idle is adequate for the active test;
Terminal condition: Terminal 15, engine on
Voltage condition:
none

Condition for fault memory entry
Downstream (post-cat) O2 sensor voltage < 0.2 V with rich
lambda specification in active test for one bank, and
downstream (post-cat) O2 sensor voltage > 0.7 V with lean
lambda specification in active test on the other bank

Action in service
Replace downstream (post-cat) O2 sensors

Fault effect and breakdown warning


Driver information
Warning light:
none

Service instruction
none