Inspection Procedure

1. Connect a Hi-Scan (Pro) to the data link connector.
2. Turn ignition switch to ON position and monitor other DTCs.

Are any other DTCs also set?

1. No:  Go to next step.
2. Yes: Do all repairs associated with those codes before proceeding with this procedure.

1. Connect a Hi-Scan (Pro) to the data link connector.
2. Erase the DTC(s).
3. Start engine and wait for cooling fan comes on.
4. Drive the vehicle under following condition.
   • Steady speed of 30 mph through 50 mph (48 kph trough 80 kph)
   • D-range in A/T vehicle (5th gear in M/T vehicle)
   • Drive until 02 monitor readiness code is set to complete or temporary DTC P0133 comes on.

Is DTC P0133 indicated?

1. Yes:  Go to next step.
2. No: Problem is intermittent or was repaired and ECM memory was not cleared. See INTERMITTENT PROBLEM INSPECTION PROCEDURE ..

Visually check exhaust system for leakage (especially between TWC converter and head) and HO2S installation status

Is all system ok?

1. Yes:  Go to next step.
2. No: Repair the abnormal system.

1. Remove HO2S.
2. Thoroughly check HO2S for contamination, deterioration or damage.

Is HO2S contaminated, deteriorated or damaged?

1. No:  Go to next step.
2. Yes: Clean or replace HO2S.

1. Install a well-known good HO2S.
2. Connect a Hi-Scan (Pro) to the data link connector.
3. Erase the DTC(s).
4. Start engine and wait for cooling fan comes on.
5. Drive the vehicle under following condition.
   • Steady speed of 30 mph through 50 mph (48 kph trough 80 kph)
   • D-range in A/T vehicle (5th gear in M/T vehicle)
   • Drive until O2 monitor readiness code is set to complete or temporary DTC P0133 comes on.

Does scan tool display DTC P0133?

1. Yes:  Proceed with ECM PROBLEM INSPECTION PROCEDURE .
2. No: Replace HO2S.