Oxygen sensor, replace

# Replace oxygen (O2) sensor

Unplug oxygen sensor.

Remove stone shield from sensor if equipped

Unscrew oxygen sensor from exhaust.

### Installation

If not already applied, cover threads of new sensor with anti seize lubricant. Take care not to apply any lubricants to any other part of the sensor other than the threads.

Tighten to correct torque.

### BMW recommended replacement intervals

Since 1985 models, BMW has used heated O2 sensors. These sensors have 3 wires and require replacement at 50,000 mile intervals. There are no warning lights on these models.

E30 M3 Repair Manual V2.7. Copyright ©1999-2001 Koala Motorsport & Brett Anderson