2C6A - P0041

2020 BMW 128i Coupe (E82) L6-3.0L (N51) Diagnostic Trouble Codes ( DTC ): Service instruction

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2C6A

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