P0133

P0133
Aging of Oxygen Sensor Ahead of Three Way Catalytic Converter (TWC) (cylinders 1 - 3)

P0153
Aging of Oxygen Sensor Ahead of Three Way Catalytic Converter (TWC) (cylinders 4 - 6)

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 ECM monitors the length of the time period of the sensor signal. With an old sensor, the time period is too long, i.e. the diffusion of oxygen into the exhaust gas is more difficult for the sensor. Reasons 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 1600 1/min and 2120 1/min. Engine load between 0.9 ms and 1.9 ms.
- Calculated catalytic converter temperature greater than 300°C.
- Oxygen sensing active.

Tiptronic
- Engine speed between 920 1/min and 1880 1/min. Engine load between 1.2 ms and 2.1 ms.
- Calculated catalytic converter temperature greater than 300°C.
- Oxygen sensing active.

No faults for misfire recognition, throttle valve, oxygen sensor heating, Hall sender, fuel tank ventilation end stage, voltage supply, mixture adaptation.

NOTE: The oxygen sensor aging test takes a maximum of 42 seconds.





Diagnostic procedure

Road test vehicle.
1. Erase DTC memory.
2. Heat oxygen sensor (road test vehicle under load, run engine at high rpm with no load).
3. Road test vehicle during which the diagnostic conditions must be reached.
4. Read DTC memory.

NOTE: Diagnosis has been performed if cycle flag No. 2 is set.