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P1275...What exactly does this mean?


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CEL...P1275 Aging of Oxygen Sensor Ahead of Catalytic Converter (Cylinders 1 - 3) - Below Lower Limit

Does "aging" mean the O2 sensor is starting to go bad but hasn't yet? After searching the forum I have noticed it seems fairly easy and inexpensive to replace, is this correct?

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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.

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.

The OBD II service book says erase the code and if comes back replace the sensor.

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