2C6B - P2270

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

none

2C6B - P2270 (DME)

2C6B - P2270

Information saved in

DME

Fault code

2C6B - P2270

Fault text

Oxygen sensor behind catalytic converter, system check

Fault description

O2 Sensor Signal Biased/Stuck Lean (Bank 1 Sensor 2)

Condition for fault identification

Test condition:

O2 sensor system check

O2 sensor voltage too high = Signal sticks at rich

Trim controller diagnosis must have been executed, see Trim controller diagnosis. Detection of malfunctions 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

O2 sensor behind catalytic converter voltage > 0.7 V with lean O2 data specification in active test

Action in service

This malfunction is detected during the active test. The active test is triggered by the trim control diagnosis function (trim controller fault code stored in the control module's fault memory!)

Initiate system test for reversed O2 sensors. Follow instructions for system test.

If the system test fails to produce a result then

Visual inspection of wiring and plugs

Electrical check of wiring

Replace wires or plugs as indicated

Check exhaust system upstream from downstream (post- cat) O2 sensor for leaks

Replace downstream (post-cat) O2 sensor

Replace upstream (pre-cat) O2 sensor

Replace control module

Fault effect and breakdown warning

Driver information Warning light: none