Component Inspection
- Perform the following inspections:
- Check for fuel contamination.
- Check for use of improper HO2S sealant.
- Check for engine oil/coolant consumption
- Inspect HO2S for silicon contamination from fuel or use of improper sealant. The HO2S may have a white powdery coating and this will result in a high but false voltage signal (rich exhaust indication)
- Are any concerns present?
YES
- Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Check HO2 sensor for contamination, deterioration, or damage. Substitute with a known-good HO2 sensor and check for proper operation. If the problem is corrected, replace HO2 sensor and go to "VERIFICATION OF VEHICLE REPAIR " procedure.