Inspection Procedures

1. Connect a Hi-Scan (Pro) to the data link connector.
2. Turn the ignition switch ON and monitor any other DTCs relating to HO2S, fuel trim, or misfire.

Are any other DTCs also set? 

No: Go to next

Yes: Do all repairs associated with those codes before going to next step.

1. Check for leaks in the exhaust system.

Are there any leaks? 

No: Go to next

Yes: Repair or replace it.

1. Thoroughly check the catalyst and the HO2S for contamination, deterioration or damage.

Are Catalytic converter or HO2S contaminated, deteriorated or damaged? 

No: Go to next

Yes: Repair or replace it.

1. Check front and rear HO2S for normal operation.

• Refer to  DTC P0130   ~ P0140   for a detailed procedure. 

Are front and rear HO2S normal? 

Yes: Go to next

No: Replace it.

1. Start the engine and warm it up to the normal operating temperature.
2. Using the Hi-Scan (Pro), monitor the rear HO2S signal.

Does the rear HO2S signal switch from 0V to 1V? 

Yes: Proceed with ECM PROBLEM PROCEDURE  .

Yes: Replace catalytic converter.