P0135

P0135

02 Sensor Heater Circuit

NOTE: The diagnosis for this fault is different, for models with turbo engines and models with naturally-aspirated engines.

Diagnosis/troubleshooting - all turbo models

NOTE: This fault can be detected in two different operating states. To find out whether the fault was recorded under load or with inertia fuel shutoff, refer to the "extended fault memory".

Diagnostic conditions for fault detection under load
- Mass air flow above 16 kg/h
- No other oxygen sensor faults
- Battery positive voltage between 10 V and 16 V

Diagnostic conditions for fault detection with inertia fuel shutoff
- Exhaust temperature above 250 °C
- Battery positive voltage greater than 10 V
- Time elapsed after start-up greater than 60 seconds
- No oxygen sensor faults
- Inertia fuel shutoff for more than 4 seconds

Possible cause of fault
- Open circuit
- Oxygen sensor faulty (heating)
- DME control module faulty

Affected terminals
DME control module, connector II, pin 19 and oxygen sensor jack ahead of catalytic converter, 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).







Diagnosis/troubleshooting - all naturally-aspirated models

Diagnostic conditions
- Exhaust temperature between 250 °C and 550 °C
- No other oxygen sensor faults
- Battery positive voltage between 10 V and 16 V
- Time elapsed after engine start-up greater than 200 seconds

Possible cause of fault
- High resistance in connector or triggering wire

Affected terminals
DME control module, connector II, pin 19 and oxygen sensor jack ahead of catalytic converter, bank 1, pin 2

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).