Inspection Procedure

CHECK DTC RELATING TO CATALYST AND REAR HO2S
1. Connect a Hi-Scan (Pro) to the data link connector.
2. Turn the ignition switch ON and monitor any other DTCs relating to catalyst and rear HO2S.
Are DTCs relating to catalyst or rear HO2S also set?
1. No: Go to next step.
2. Yes: Do all repairs associated with those codes before proceeding with this procedure.
CHECK AIR LEAKAGE
Check the exhaust system for leaks

Are any leaks found?
1. No: Go to next step.
2. Yes: Repair or replace it.
CHECK CATALYTIC CONVERTER AND REAR HO2S CONDITIONS
Thoroughly check the catalyst and rear HO2S for contamination, deterioration or damage.

Is linear O2 sensor contaminated, deteriorated or damaged?
1. No: Proceed with ECM PROBLEM INSPECTION PROCEDURE .
2. Yes: Repair or replace it.