Isuzu Ascender 2003-05

Oil Pressure Sensor

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Removal & Installation



4.2L Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Raise the vehicle.
  4.  
  5. Remove the engine shield.
  6.  
  7. Remove the electrical connector from the oil pressure switch.
  8.  
  9. Remove the oil pressure switch.

    Click image to see an enlarged view

    Fig. Oil pressure switch and related parts

  10.  

To install:

  1. Install the oil pressure switch.
  2.  
  3. Tighten the oil pressure switch to 15 ft. lbs. (20 Nm).
  4.  
  5. Install the electrical connector to the oil pressure switch.
  6.  
  7. Connect the negative battery cable.
  8.  

5.3L
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the intake manifold.
  4.  
  5. Disconnect the oil pressure sensor electrical connector.
  6.  
  7. Using oil pressure socket remove the oil pressure sensor.

    Click image to see an enlarged view

    Fig. Oil pressure sensor removal

  8.  

To install:

  1. Apply sealant to the threads of the oil pressure sensor.
  2.  
  3. Install the oil pressure sensor.
  4.  
  5. Tighten the oil pressure sensor to 26 ft. lbs. (35 Nm).
  6.  
  7. Connect the oil pressure sensor electrical connector.
  8.  
  9. Install the intake manifold.
  10.  
  11. Connect the negative battery cable.
  12.  

Testing



Inspect oil pressure sensor for signs of oil leaks, and a poor or damaged electrical connector.

  1. Scan, record and reset any Diagnostic Trouble Codes present.
  2.  

 
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