2C77

2C77 - P0140

Information saved in
DME

Fault code
2C77 - P0140

Fault text
Oxygen sensor behind catalytic converter, signal

Fault description
O2 Sensor Circuit No Activity Detected (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
O2 sensor voltage between 0.4 V and 0.5 V;
internal resistance in downstream oxygen sensor's circuit
exceeds 60 kOhms

Action in service
1. Visual inspection of wiring and plugs
2. Measure resistance
3. Replace affected wire
4. Replace wiring harness
5. Replace O2 sensor

Fault effect and breakdown warning


Driver information
Warning light:
MIL ON

Service instruction
none