Check Resistance

Turn "OFF" the ignition switch. Disconnect HO2S connector.
Measure resistance between ground terminal of HO2S(B1/S1) harness connector and chassis ground.
Specification : Approx. 0Ω
Is resistance within the specification?
YES
- Go to "COMPONENT INSPECTION " procedure.
NO
- Repair or replace as necessary and Go to "VERIFICATION OF VEHICLE REPAIR " procedure.