P0133

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

P1275
Aging of Oxygen Sensor Ahead of Three Way Catalytic Converter (cylinders 1 - 3) - Below Lower Limit.

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

P1276
Aging of Oxygen Sensor Ahead of Three Way Catalytic Converter (cylinders 4 - 6) - 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 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 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 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 active.

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

Wiring Diagrams:




Diagnostic Procedure:



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