Oxygen Sensor Relay: Locations

Relay assignment, engine wiring harness (M40, M42, M43, M43TU, M44, M50, M52, M52TU, S52, S50US)

Before removing the relays:
Read fault memory of DME control unit.
Switch off ignition.







Unfasten and remove cover.

Installation location:
1. Relay for oxygen-sensor heating
2. Master relay for Digital Motor Electronics (DME)
3. Relay for electric fuel pump (EKP)

Installation:
Read fault memory of DME control unit, check faults in memory, then cancel fault memory.