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P0133 Code


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P0133 Signal Period for Oxygen Sensor Ageing, Bank 1 – Above/Below Limit

The diagnosis of "oxygen sensor aging" helps to identify oxygen sensors ahead of TWC that lead to emission limits being exceeded because of aging.

During the diagnosis of oxygen sensor aging, the DME control module monitors the period (oscillating frequency) 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.

If it comes back you likely need to replace that O2 sensor. Most O2 sensors age beyond spec or fail after 60,000 plus miles.

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