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).

Work Instruction 1:

Work Instruction 2 - 5: