2019 BMW 128i Convertible (E88) L6-3.0L (N51) A L L Diagnostic Trouble Codes ( DTC ): Manufacturer Code Charts Page 140
Condition for fault memory entry
Self-diagnosis processor chip has short to positive
Action in service
1. Visual inspection of wires, DME plug and O2 sensor for
damage
2. Check wires
3. Check plug-in connections DME <=> Wiring harness
<=> Upstream (pre-cat) O2 sensor for Bank 2
4. Check wiring harness for shorts to positive or ground and
shorts/shunt to other bank (melted?) => Replace wiring
harness
5. Replace O2 sensor
6. Replace DME
Fault effect and breakdown warning
Driver information
Warning light:
MIL ON
Service instruction
none
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
