Visually/physically inspect the following items:
- Inspect the front HO2S for any 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
- 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 GDSand monitor the O2 SNSR VOL.-B1/S1 parameter on the GDSdata list
Specification : Verify signal is switching from rich(above 0.45V) to lean(below 0.45V) a minimum of 3 times in 10 seconds (voltage will vary between 0.1 and 0.9V) at idle.
Is sensor switching properly?
 | ▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure |
 | ▶ Check valve timing. Refer to "P0016: Crankshaft Position-Camshaft Position Correlation(Bank1)" procedure. Repair as necessary and go to "Verification of Vehicle Repair" procedure |
