P2629

P2629

Oxygen sensor upstream

NOTE: The fault "Over limit value" is detected if the oxygen sensor voltage is > 1.5 V for an uninterrupted period of more than 5 s.

Diagnostic conditions
- DME control module power supply 10.5 V ... 16 V
- Oxygen sensor heater switched on for > 70 s
- Oxygen sensing active
- Exhaust temperature 600 °C (1,112 °F)... 750 °C (1,382 °F)
- min. 3 s overrun
- No secondary air injection or diagnosis of secondary air system active
- No tank ventilation or diagnosis of tank ventilation system active
- No other oxygen-sensor faults stored

Possible fault causes
- Fault in oxygen sensor heater -> If this exists, is to be taken care of first
- Loose contact or corrosion in the connector
- Short circuit to B+/ground/between wires or open circuit in the wiring
- Heater injection
- Oxygen sensor faulty
- DME control module faulty