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 terminal tension (at the HO2S and at the ECM)
   • 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 false (high) 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 then 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.