BMW 318/325/M3/525/535/M5 1989-1993 Repair Information

Oxygen Sensor

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REMOVAL & INSTALLATION



  1. Turn the ignition switch OFF .
  2.  
  3. The exhaust system on the M30 engine equipped vehicles may have to be disconnected at the exhaust manifolds to gain enough working room.
  4.  
  5. Remove the heat shield from the oxygen sensor body and disconnect the electrical connector.
  6.  
  7. Unscrew the oxygen sensor from the exhaust system.
  8.  

To install:
  1. Coat the threads of the oxygen sensor with anti-seize. Do not clean or lubricate the sensor portion of the unit. Do not cover the oxygen sensor connector when undercoating.
  2.  
  3. Check the inside threads of the oxygen sensor port. Clean any carbon build-up.
  4.  
  5. Thread in the oxygen sensor by hand. Torque the unit to 40 ft. lbs. (55 Nm).
  6.  
  7. Connect the oxygen sensor electrical connector.
  8.  

 
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