Code No. P0133: Oxygen Sensor (front) Circuit Slow Response




OPERATION




FUNCTION




TROUBLE JUDGMENT


Check Conditions
Judgement Criterion

FAIL-SAFE AND BACKUP FUNCTION




PROBABLE CAUSES




DIAGNOSIS PROCEDURE


STEP 1. M.U.T.-III data list



  • Data list reference table (Refer to ).

  1. Item AC: Oxygen sensor (front)

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Go to Step 2.

STEP 2. Check oxygen sensor (front) itself.



  • Oxygen sensor (front) check (Refer to ).

Q. Is the check result normal?

Go to Step 3.
Replace oxygen sensor (front).

STEP 3. Connector check: oxygen sensor (front) connector and engine-ECU connector


Q. Are the check results normal?

Go to Step 4.
Repair or replace the connector.

STEP 4. M.U.T.-III data list



  • Data list reference table (Refer to ).

  1. Item AC: Oxygen sensor (front)

Q. Is the check result normal?

Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).
Replace the engine-ECU.