BMW 328i Sedan (E90) L6-3.0L (N51) P code charts 40
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
P0050
2C9D - P0050
Information saved in
DME
Fault code
2C9D - P0050
Fault text
Oxygen sensor heating before catalytic converter 2,
activation
Fault description
HO2S Heater Control Circuit (Bank 2 Sensor 1)
Condition for fault identification
Test condition:
Driver circuit diagnosis for O2 sensor heater
UBatt > 10V
Sensors installed
No fault memories
Terminal condition: Terminal 15, engine on
Voltage condition:
none
Condition for fault memory entry
Active immediately after terminal 15 change; electr. faults
