Component Inspection

HO2S Inspection
1. Visually/physically inspect the HO2S for the following conditions:
  - Ensure that the HO2S is securely installed. (Pigtail and wiring harness not making contact with the exhaust pipe)
  - Check for corrosion on terminals, and check terminal tension (at the HO2S and at the PCM)
  - Front HO2S for silicon contamination. This contamination will be indicated by a white powdery coating on the portion of the sensor exposed to the exhaust stream, and this will result in a high (but false) voltage signal.
  - Fuel, engine coolant, or oil contamination
  - Use of improper sealant
2. Was a problem found in any of the above areas?
  YES
  - Repair or replace as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
  NO
  - Substitute with a known-good component and check for proper operation. If the problem is corrected, replace component and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.