P0156

P0156

NOTE:
- Signal implausible: Turbo models up to model year 01 only
- Below limit: Turbo only
- Above limit: All models

02 Sensor Circuit

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

Possible cause of fault
- Short circuit to ground in signal wire
- Intercore short circuit

Affected terminals
DME control module connector II, pin 8 and oxygen sensor jack, bank 1, pin 3.

DME control module connector II, pin 14 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).







02 Sensor Circuit Slow Response

Diagnostic conditions
- Air mass between 25 kg/h and 120 kg/h
- Oxygen sensing after catalytic converter is active
- Basic adaptation has reached steady condition
- No secondary air diagnosis
- No fuel tank ventilation diagnosis
- EVAP canister not highly loaded
- No other oxygen sensor faults

Possible cause of fault
- Oxygen sensor faulty

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).