Check Resistance

IG "OFF". Disconnect HO2S connector.
Measure resistance between ground terminal of HO2S (B1/S2) 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.

NOTE: HO2S must have a clean air reference to function properly. The air is obtained by way of the sensor wire(s). Do not attempt to repair the wire(s), connector, or the terminals.