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 SystemsHow to Troubleshoot the CVT System(CVT System) .
• 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 (in P or N) 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)
  • Transmission in D
  • Engine speed between 1, 250-3, 000 rpm
  • Drive the vehicle at 25 mph (40 km/h) or less for 5 minutes, then drive at a steady speed of 33 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 

  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 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.