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