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Home >> Cadillac >> 2004 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 199 (Engine Control System) >> Front Heated Oxygen Sensor (Ho2S) Inspection >> Front HO2S circuit open/short inspection (sensor) >> Notes
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Front HO2S circuit open/short inspection (sensor): Notes

WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disconnect the PCM connector.
  2. Disconnect the front HO2S connector.
  3. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)


  1. Disconnect the PCM connector.
  2. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
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