P0137

P0137

02 Sensor Circuit Low Voltage

Diagnostic conditions
- Exhaust temperature between 250°C and 750°C
- Time elapsed after engine start-up greater than 200 seconds
- Battery positive voltage between 10 V and 16 V
- Oxygen sensing system active
- No other oxygen sensor faults
- No secondary air
- No diagnosis of secondary air system
- No fuel tank ventilation
- No diagnosis of fuel tank ventilation system

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 11 and oxygen sensor jack, bank 1, pin 3

DME control module connector II, pin 17 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).