Oxygen sensor adaptation

The lambda adaptation (mixture adaptation) compensates for component tolerances and ageing that can affect the air-fuel ratio. Factors such as vacuum leaks and fuel pressure can also affect the lambda adaptation (partial compensation). This is why it is not possible to define precise lambda control limits as fault causes.

Multiplicative mixture adaptation is effective throughout the entire characteristic map. An example of an essential factor is fuel pressure. The "Reset adaptation values" service function can be used to reset the adaptation values and the equipment versions to their initial delivery status. Then the adaptation values must be relearned by the system. In order to initialize the system and allow it to "learn" the mixture-adaptation data it is necessary to operate the vehicle for an extended period between idle and part-load.