Friday, August 2, 2019

2C9C - P0031

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



none









2C9C - P0031 (DME)



2C9C - P0031







Information saved in



DME









Fault code



2C9C - P0031









Fault text



Oxygen sensor heating before catalytic converter, activation









Fault description



HO2S Heater Control Circuit Low (Bank 1 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 entered within a few seconds









Action in service



Visual inspection of wires, DME plug and O2 sensor for damage



Check wires



Check plug-in connections DME <=> Wiring harness



<=> Upstream O2 sensor forward of catalyst for Bank 1





Replace O2 sensor



Replace DME







Fault effect and breakdown warning







Driver information Warning light: MIL ON

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