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Oxygen Sensors: Installation

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Correct tightening of oxygen sensor is critical to prevent crushing glass beads in graphite anti-seize compound. Crushing glass beads will cause sensor to seize in exhaust pipe. This may necessitate repair or replacement of exhaust pipe upon next removal.
  1. Whenever oxygen sensor is removed, coat threads with anti-seize compound (5613695) before reinstallation. New oxygen sensors already have this compound applied to threads.
  2. Install oxygen sensor into exhaust pipe using Oxygen Sensor Tool (J-39194-B). Tighten oxygen sensor to specification. See TORQUE SPECIFICATIONS . Reconnect harness connector to oxygen sensor. Install the CPA retainer.
  3. On HO2S1/2, Install the connector to the crossmember. On HO2S2/1, Install the harness clip. Install the clip securing the HO2S2/1 to the engine harness. On all HO2S, Lower vehicle. Test system.
Fig 1: Locating Heated Oxygen Sensors (4.3L, 4.8L & 5.3L Shown; 6.0L & 8.1L Are Similar)
G00147744Courtesy of GENERAL MOTORS CORP.


  1. If reinstalling the old sensor, coat the threads with anti-seize compound GM (12377953), or equivalent. Install the HO2S and tighten the sensor to specification. See TORQUE SPECIFICATIONS . Connect the HO2S electrical connector. Connect the connector CPA retainer.
  2. On HO2S1/1 and HO2S1/2, install the electrical connector to the fuel line clip. On HO2S2/1 and HO2S2/2, install the electrical connector to the frame.
  3. On HO2S1/1, if necessary, bolt the front propeller shaft to the front differential. If equipped, connect the fuel composition sensor electrical connector. On HO2S1/2, if equipped, connect the fuel composition sensor electrical connector. Lower the vehicle.


If reinstalling the old sensor, coat the threads with anti-seize compound GM (12377953), or equivalent. Install the HO2S and tighten to specification. See TORQUE SPECIFICATIONS . Connect the HO2S electrical connector. Connect the CPA retainer. Lower the vehicle.

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