DTC P0133: O2 Sensor (HO2S) Circuit Slow Response (Sensor-1)
Wiring Diagram
1. Shield wire 4. “IG” fuse 7. To HO2S-2 heater 10. Relay box
2. Ignition switch 5. HO2S-1 8. ECM 11. “IGN1” fuse
3. Circuit fuse box 6. Heater 9. To other sensor      
DTC Detecting Condition and Trouble Area
DTC detecting condition Trouble area
Response time (time to change from lean to rich or from rich to lean) of HO2S-1 output voltage is about 1 sec. at minimum or average time of 1 cycle is 5 sec. at minimum.
(*2 driving cycle detection logic, monitoring once/1 driving)
Heated oxygen sensor-1
DTC Confirmation Procedure
When performing a road test, select a place where there is no traffic or possibility of a traffic accident and be very careful during testing to avoid occurrence of an accident.
Road test should be carried out with 2 persons, a driver and a tester, on a level road.
Check to make sure that the following conditions are satisfied when using this “DTC Confirmation Procedure”.
Intake air temperature at engine start: –10 °C (14 °F) to 80 °C (176 °F)
Intake air temperature: –10 °C (14 °F) to 70 °C (158 °F)
Engine coolant temperature: 70 °C (158 °F) to 150 °C (302 °F)
Altitude (barometric pressure): 2400 m, 8000 ft or less (560 mmHg, 75 kPa or more)
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch and clear DTC using scan tool.
3) Start engine and warm up to normal operating temperature.
4) Drive vehicle at 40 mph (60 km/h) or higher. (engine speed: 2500 – 3000 r/min.)
5) Keep above vehicle speed for 6 min. or more. (Throttle valve opening is kept constant in this step.)
6) Release accelerator pedal and with engine brake applied, keep vehicle coasting (with fuel cut for 3 sec. or more) and then stop vehicle.
7) Check if DTC and pending DTC exists by using scan tool. If not, check if oxygen sensor monitoring test has completed by using scan tool. If not in both of above checks (i.e., no DTC and pending DTC and oxygen sensor monitoring test not completed), check vehicle condition (environmental) and repeat Step 3) through 6).
DTC Troubleshooting
Step Action YES NO
Was “Engine and Emission Control System Check” performed?
Go to Step 2.
Is there DTC(s) other than HO2S-1 (DTC P0133)?
Go to applicable DTC diag. flow.
Replace HO2S-1.
Upon completion of inspection and repair work, perform “DTC Confirmation Procedure” and confirm that the trouble has been corrected.