P0131

P0131

02 Sensor Circuit Low Voltage

Diagnostic conditions
- Battery positive voltage between 10 V and 16 V
- Oxygen sensing system active
- No secondary air
- No diagnosis of secondary air system
- No fuel tank ventilation

Possible cause of fault
- Short circuit to ground in signal wire
- Oxygen sensor faulty
- Control module faulty

Affected pins
DME control module connector II, pin 9 and oxygen sensor jack, bank 1, pin 3

DME control module connector II, pin 15 and oxygen sensor jack, bank 1, pin 4

Diagnosis/troubleshooting

NOTE: Do not use contact spray on the oxygen sensor plug connections as this may cause irreparable damage to the wiring (contamination of the oxygen sensor via the reference air channel).

Part 1:

Part 2: