Aging of Oxygen Sensor Ahead of Catalytic Converter (Cylinders 1 - 3) - Below Lower Limit

P0133

Aging of Oxygen Sensor Ahead of Catalytic Converter (Cylinders 1 - 3) - Below Lower Limit

Function
The diagnosis of "oxygen sensor aging" helps to identify oxygen sensors that exceed emission limits because of aging.

During the diagnosis of oxygen sensor aging, the DME control module monitors the period of the sensor signal.

With an old sensor, the duration of the period is too long, i.e. it is more difficult for the sensor to diffuse oxygen into the exhaust gas. Reasons for this could be frequent driving in the lower load range (city driving, short distances, etc.) or a contaminated sensor.

Diagnosis conditions

Manual transmission
Engine speed between 1400 rpm and 2600 rpm.
Engine load between 0.7 ms and 1.5 ms.
Calculated catalytic converter temperature greater than 350 °C..
Oxygen sensing system active.

Tiptronic
Engine speed between 1200 rpm and 2200 rpm.
Engine load between 0.7 ms and 1.8 ms.
Calculated catalytic converter temperature greater than 350 °C
Oxygen sensing system active.

No faults for misfire recognition, throttle valve, oxygen sensor heating, camshaft position sensor, fuel tank ventilation system, EVAP canister purge valve output stage, voltage supply or mixture adaptation.

P0133-P1276:

Wiring Diagram







Diagnosis Procedure







1 Road test vehicle or perform short test.

1. Erase fault memory.
2. Heat oxygen sensors (road test vehicle under load, run engine at high rpm with no load).
3. Road test vehicle or perform short test, ensuring that the diagnosis conditions are reached.
4. Read fault memory.