P2231

P2231

Oxygen Sensor Upstream

Diagnostic conditions
- DME control module power supply 10.5 V ... 16 V
- Exhaust temperature < 800 degrees C (1,472 degrees F)
- Oxygen sensor temperature > 685 degrees C (1,265 degrees F)
- Catalytic converter heating not active
- Secondary air injection not active
- No other oxygen-sensor faults upstream stored

Possible fault causes
- High resistance short circuit to B+ in signal wire
- Heater injection
- Oxygen sensor faulty
- DME control module faulty