Visual Check
- Ignition "OFF" and disconnect HO2S (S2) connector.
- Check that HO2S (S2) is contaminated or damaged by foreign materials.
- Does the HO2S (S2) work properly? (Check variation)
YES
- Go to "VERIFICATION OF REPAIR " procedure.
NO
- Carefully re-do this troubleshooting guide steps.
- If problem still occurs, replace HO2S (S2) and then Go to "System Inspection" procedure.