02 Sensor Circuit No Activity Detected

P0134

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 9 and oxygen sensor connector after catalytic converter, bank 1, pin 5

DME control module connector II, pin 15 and oxygen sensor connector after catalytic converter, bank 1, 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 9 and oxygen sensor jack, bank 1, pin 3

DME control module connector II, pin 15 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).

Part 1:

Part 2:

Part 3: