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Check Resistance

Ignition switch is turned "ON". Disconnect HO2S (B1/S2) 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.