2C7B - P0139

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

none

2C7B

2C7B - P0139

Information saved in

DME

Fault code

2C7B - P0139

Fault text

Oxygen sensor behind catalytic converter, signal

Fault description

O2 Sensor Circuit Slow Response (Bank 1 Sensor 2)

Condition for fault identification

Test condition:

O2 sensor behind catalytic converter voltage too high with overrun injection deactivation active; signal sticks at rich Terminal condition: Terminal 15, engine on

Voltage condition: none

Condition for fault memory entry

Voltage > 0.2 V

Action in service

Check wiring

Check plugs

Measure wire resistance against positive and ground

Replace Bank 1 downstream (post-cat) O2 sensor

Fault effect and breakdown warning

Driver information Warning light: none