DTC Troubleshooting: P0133
DTC P0133: A/F Sensor (Sensor 1) Malfunction/Slow Response
NOTE:
Before you troubleshoot, review the general troubleshooting information.
If DTC P0139 is stored at the same time as DTC P0133, troubleshoot DTC P0139 first, then recheck for DTC P0133.

DTC Description
Confirmed DTC
Pending DTC
P0133 A/F Sensor (Sensor 1) Malfunction/Slow Response
    

1.
Problem verification:

Problem verification
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Start the engine.

?4.
Hold the engine speed at 3,000 rpm without load (CVT in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.

?5.
Test-drive the vehicle under these conditions:
Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
CVT in D, M/T in 3rd or 4th
Engine speed between 1,250?3,300 rpm
Drive the vehicle at 25 mph (40 km/h) or less for 5 minutes, then drive at a steady speed of 32 mph (52 km/h) or more

Signal
Current conditions
Values
Unit
ECT SENSOR 1
    
ENGINE SPEED
    
VEHICLE SPEED
    

?6.
Monitor the OBD STATUS for DTC P0133 in the DTCs MENU with the HDS.
DTC Description
OBD STATUS
P0133 A/F Sensor (Sensor 1) Malfunction/Slow Response
  

Does the HDS indicate FAILED?

     
YES
     
     
     
The failure is duplicated. Replace the A/F sensor (Sensor 1).?
     
NO
     
     
     
If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 1-3 on this step and recheck.?