Connect Scantool & Engine "ON"

Warm up the engine to normal operating temperature.

Monitor HO2S voltage(B1/S1) parameter on scantool

Specification : Voltage will vary from 0.1 to 0.9 V

Is the HO2S parameter displayed within specifications ?

YES

▶ Fault is intermittent caused by poor contact in the sensor’s and/or PCM’s connector or was repaired and PCM memory was not cleared. Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure

NO

▶ Go to "Component Inspection" procedure