OBD (II) - P0010 - P0199: P0135: Diagnosis/troubleshooting: Notes

NOTE: Do not use contact spray on the oxygen sensor plug connections, as this may cause irreparable damage to the wiring (blocking the reference air channels).

NOTE: Do not confuse oxygen sensor in front of catalytic converter and oxygen sensor behind catalytic converter as this will cause implausible fault entries.

Distinguishing feature of both sensors:

Oxygen sensor in front of catalytic converter (LSU) has a six-pin connector

Fig 1: Identifying Oxygen Sensor Six-Pin Connector

Courtesy of PORSCHE OF NORTH AMERICA, INC.

Oxygen sensor behind catalytic converter (LSF) has a four-pin connector

Fig 2: Identifying Oxygen Sensor Four-Pin Connector

Courtesy of PORSCHE OF NORTH AMERICA, INC.

NOTE: If connector A is disconnected from the DME control module and the ignition is or was switched on, the 'DME Control Module TIMEOUT' fault is recorded in many control modules.

NOTE: If control module connector A was disconnected from the DME in the course of troubleshooting or if the voltage supply was interrupted elsewhere (battery, fuse), the throttle adjusting unit must be adapted.