GM: Electra/Park Avenue/Ninety-Eight 1990-1993

Oxygen Sensor

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Fig. Fig. 1 Oxygen sensor and its internal elements



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Fig. Fig. 2 Oxygen sensor location on the rear exhaust manifold. Note the spark plug heat shield nearby

REMOVAL & INSTALLATION



  1. To ease removal of the oxygen sensor and prevent thread damage, run the engine for a short time to heat up the exhaust system. Disconnect the negative battery cable.
  2.  
  3. Disconnect the electrical connector.
  4.  
  5. Carefully back out the oxygen sensor. Do not use solvents to clean the sensor. If the sensor is dropped, it should be replaced.
  6.  

To install:

  1. Coat the threads of the oxygen sensor with anti-seize compound.
  2.  
  3. Carefully thread the sensor on by hand and tighten with a wrench.
  4.  
  5. Connect the connector.
  6.  

 
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