Wednesday, September 18, 2019

2C31 - P2096

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



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2C31 - P2096 (DME)



2C31 - P2096







Information saved in



DME









Fault code



2C31 - P2096









Fault text



Oxygen sensor before catalytic converter, trim control









Fault description



Post Catalyst Fuel Trim System Too Lean (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

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