Visual Check

Ignition "OFF" & Disconnect HO2S (B2/S1) connector.
Check that HO2S (B2/S1) is contaminated or damaged by foreign materials.
Have any problems been found?
YES
- Repair or replace as necessary and then, go to "VERIFICATION OF REPAIR " procedure.
NO
- Go to "CHECK HO2S (B2/S1) PERFORMANCE " procedure.