P1170

DTC P1170
Lambda sensor aging tv bank 1 Drive cycle C:Signal out of range - above maximum.

DTC P1170
Lambda sensor aging tv bank 1 Drive cycle C:Signal out of range - below minimum.

Possible causes by suggested order of priority:
^ Deteriorated upstream oxygen sensor.
^ Deteriorated downstream oxygen sensor.

Deteriorated Upstream Oxygen Sensor.
POSSIBLE FAULTS
^ The Motronic ECM has internally diagnosed that the switching characteristics of this oxygen sensor have degraded to a point where exhaust emissions will be increased.
^ This fault is usually 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.

Deteriorated Downstream Oxygen Sensor.
POSSIBLE FAULTS
^ The Motronic ECM has internally diagnosed that the characteristics of the upstream oxygen sensor have degraded to a point where exhaust emissions will be increased, however, this fault can sometimes be caused by the failure of the downstream sensor on the same bank causing an incorrect fault diagnosis. Also if both oxygen sensors (upstream and downstream) are flagged as faulty then the fault may in fact be only in the downstream sensor.
^ The fault is normally caused by the aging of the sensor(s) in normal operation, however, the effect can be accelerated if the sensor has been contaminated with oil or other surface contamination.