P0154

P0154

02 Sensor Circuit No Activity Detected

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: The DTC here covers the coupling of oxygen sensor heating into the sensor signal.

Diagnostic conditions
- Vehicle at operating temperature, then 3 minutes idle speed followed by 30 seconds increased idle speed.

Possible cause of fault
- Short circuit in oxygen sensor wiring
- Oxygen sensor faulty (heater coupling or heating)
- DME control module faulty

Affected terminals
DME control module connector II, pin 10 and oxygen sensor connector ahead of catalytic converter, bank 2, pin 5.

DME control module connector II, pin 16 and oxygen sensor connector ahead of catalytic converter, bank 2, pin 1.

Diagnosis/troubleshooting - all turbo models

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

NOTE: The DTC covers electrical open circuits here.

Diagnostic conditions
- Exhaust temperature between 400°C and 800°C
- Battery positive voltage between 10 V and 16 V
- Oxygen sensor heating switched on for at least 120 seconds

Possible cause of fault
- Loose contact in connector
- Open circuit in the oxygen sensor signal wire
- Open circuit in the oxygen sensor ground wire
- Oxygen sensor faulty (also heating)
- DME control module faulty

Affected terminals
DME control module connector II, pin 10 and oxygen sensor jack, bank 2, pin 3.

DME control module connector II, pin 16 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).

Part 1:

Part 2: