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:
Oxygen sensor system check
Oxygen sensor voltage too low = Signal sticks at lean on
one bank and oxygen sensor voltage too high = Signal sticks
on rich on the other bank
Trim controller diagnostic routine must be completed, see
trim controller diagnosis. Detection of faults during the trim
control diagnosis triggers the active test. Engine running at
idle is sufficient for active test
Terminal condition: Terminal 15, engine on
Voltage condition:
Voltage in onboard electrical system > 10 V

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
Exchange mutual positions of post-cat oxygen sensors

Fault effect and breakdown warning


Driver information
Warning light:
NO

Service instruction
none