HO2S Inspection
WARNING: This page is about a different variant/trim than selected.
- 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 but false (high) voltage signal
- Fuel, engine coolant or oil contamination.
- Use of improper sealant.
- If contamination is evident on the HO2S, Fix the source of the sensor contamination before replacing the sensor to prevent future contamination. go to "VERIFICATION OF VEHICLE REPAIR " procedure.
- Warm up the engine to normal operating temperature and let it idle.
- Connect GDS and monitor the "O2 Sensor Linear Type Bank1 Upstream" and "O2 Sensor Binary Type Bank1 Downstream" parameters on the GDS data list.
Specification: Refer to below figure.
- 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
- Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.