P0159

DTC P0159
Lambda sensor aging downstream bank 2 Drive cycle C:Signal out of range - above maximum.

DTC P0159
Lambda sensor aging downstream bank 2 Drive cycle C:Signal out of range - below minimum.

Possible causes by suggested order of priority:
- Deteriorated oxygen sensor.

Deteriorated oxygen sensor.
- The Motronic ECM has internally diagnosed that the switching characteristics of this oxygen sensor have degraded to a point where on board diagnostics will be affected.
- This fault is normally caused by the aging of the sensor in normal operation, however, this effect can be accelerated if the sensor has been contaminated with oil or other surface contamination.