2C73 - P0138

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

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2C73

2C73 - P0138

Information saved in

DME

Fault code

2C73 - P0138

Fault text

Oxygen sensor behind catalytic converter, signal

Fault description

O2 Sensor Circuit High Voltage (Bank 1 Sensor 2)

Condition for fault identification

Test condition:

O2 sensor signal test No fault memories

Terminal condition: Terminal 15, engine on Voltage condition:

none

Condition for fault memory entry

Voltage on Bank 1 O2 sensor behind catalytic converter greater than 4.6 V

Action in service

Check wiring

Measure downstream (post-cat) O2 sensor voltage

Check plug

Replace Bank 1 downstream (post-cat) O2 sensor

Fault effect and breakdown warning

Driver information Warning light: MIL ON