P0140 Oxygen Sensor Behind Catalytic Converter, Open Circuit

P0140

Oxygen sensor behind catalytic converter, open circuit

Diagnostic conditions
- DME control module supply voltage 10 V ... 16 V
- Time after engine starts > 200 s
- Oxygen sensor heater performance > 80% for > 60s
- Exhaust temperature 200 °C ... 800 °C

Possible fault causes
- Fault in the oxygen sensor heater, if this exists, is to be taken care of first
- Loose contact or corrosion in the connector
- Open circuit in the signal leads
- Open circuit in ground lead
- Oxygen sensor faulty
- DME control module faulty