P0157

P0157

Oxygen Sensor After Catalytic Converter, Below Limit Value

Diagnostic conditions
- Exhaust temperature < 800 degrees C
- Oxygen sensor behind catalytic converter ready for operation
- DME control module supply voltage 10 V ... 16 V
- No other oxygen-sensor faults
- No secondary air
- No secondary air system diagnosis
- No tank ventilation
- No tank ventilation diagnosis

Possible fault causes
- Short circuit to ground in signal wire
- Oxygen sensor faulty
- DME control module faulty