2C31 - P2097

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

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2C31 - P2097 (DME)

2C31 - P2097

Information saved in

DME

Fault code

2C31 - P2097

Fault text

Oxygen sensor before catalytic converter, trim control

Fault description

Post Catalyst Fuel Trim System Too Rich (Bank 1)

Condition for fault identification

Test condition:

O2 sensor trim control No fault memories

Drive at 50 - 80 km/h and at moderate engine speed. Terminal condition: Terminal 15, engine on Voltage condition:

none

Condition for fault memory entry

Trim controller pegged

Action in service

This malfunction automatically triggers an active test (collateral fault stored in the control module's fault memory!).

Read out results of active test (are other faults still stored in the control module's fault memory)? => Then continue at this point!)

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 wiring or plugs as indicated

Check exhaust system forward of downstream (post-cat) O2 sensor for leaks

Replace upstream (pre-cat) O2 sensor

Replace downstream (post-cat) O2 sensor

Replace control module

Fault effect and breakdown warning

Driver information Warning light: MIL ON