DTC P0133: A / F Sensor (Sensor 1) Malfunction / Slow Response

NOTE: 

• Before you troubleshoot, review the general troubleshooting information - Refer to: HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS or How to Troubleshoot the CVT System (CVT) .
• If DTC P0139 is stored at the same time as DTC P0133, troubleshoot DTC P0139 first, then recheck for DTC P0133.

DTC (PGM-FI)

1. 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 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, 500-4, 000 rpm
   • Drive the vehicle at 25 mph (40 km/h) or less for 5 minutes, then drive at a steady speed of 26 mph (41 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 

   Replace 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 A/F sensor (Sensor 1) and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/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.