P0157

P0157

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 8 and oxygen sensor jack, bank 2, pin 3.

DME control module connector II, pin 14 and oxygen sensor jack, bank 2, 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).