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DTC P0135: A/F Sensor (Sensor 1) Heater Circuit Malfunction

WARNING: This page is about a different car, the 2013 Honda Fit, 2012 Honda Fit, 2011 Honda Fit, 2010 Honda Fit, and 2009 Honda Fit. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review GENERAL TROUBLESHOOTING INFORMATION .
  1. Turn the ignition switch to ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3, 000 rpm without load (A/T in P or N, M/T in neutral) until the radiator fan comes on, then let it idle.
  4. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0135 indicated? 

    YES:  Go to step  5.

    NO:  Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay, and the ECM/PCM.

  5. Turn the ignition switch to LOCK (0).
  6. Check the No. 26 LAF (A/F SENSOR) (10A) fuse in the under-dash fuse/relay box.

    Is the fuse OK? 

    YES:  Go to step  7.

    NO:  Go to step  21.

  7. Open the fuse access panel (A), then remove the A/F sensor relay (B) from the under-dash fuse/relay box.
    Fig 1: Identifying Fuse Access Panel & A/F Sensor Relay
    G05952859Courtesy of AMERICAN HONDA MOTOR CO., INC.
  8. Test the A/F sensor relay (see POWER RELAY TEST ).

    Is the A/F sensor relay OK? 

    YES:  Go to step  10.

    NO:  Replace the A/F sensor relay, then go to step  26.

  9. Remove the under-cowl panel. (see UNDER-COWL PANEL REPLACEMENT )
  10. Disconnect the A/F sensor (Sensor 1) 4P connector.
  11. At the sensor side, measure the resistance between A/F sensor (Sensor 1) 4P connector terminals No. 3 and No. 4.

    Is there 1.9-2.7 Ω at room temperature? 

    YES:  Go to step  12.

    NO:  Go to step  25.

    Fig 2: Measuring Resistance Between A/F Sensor (Sensor 1) 4P Connector Terminals No. 3 & No. 4
    G05952860Courtesy of AMERICAN HONDA MOTOR CO., INC.
  12. At the sensor side, check for continuity between A/F sensor (Sensor 1) 4P connector terminals No. 2 and No. 3, and between terminals No. 2 and No. 4 individually.

    Is there continuity? 

    YES:  Go to step  25.

    NO:  Go to step  13.

    Fig 3: Checking Continuity Between A/F Sensor (Sensor 1) 4P Connector Terminals No. 2 & No. 3 & Terminals No. 2 & No. 4
    G05952861Courtesy of AMERICAN HONDA MOTOR CO., INC.
  13. Jump the SCS line with the HDS.
  14. Disconnect ECM/PCM connector C (49P).
  15. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 3 and ECM/PCM connector terminal C9.

    Is there continuity? 

    YES:  Go to step  16.

    NO:  Repair open in the wire between the ECM/PCM (C9) and the A/F sensor (Sensor 1), then go to step  26.

    Fig 4: Checking Continuity Between A/F Sensor (Sensor 1) 4P Connector Terminal No. 3 & ECM/PCM Connector Terminal C9
    G05952862Courtesy of AMERICAN HONDA MOTOR CO., INC.
  16. Connect A/F sensor (Sensor 1) 4P connector terminal No. 4 to body ground with a jumper wire.
    Fig 5: Connecting A/F Sensor (Sensor 1) 4P Connector Terminal No. 4 To Body Ground With Jumper Wire
    G05952863Courtesy of AMERICAN HONDA MOTOR CO., INC.
  17. Check for continuity between A/F sensor relay 4P connector terminal No. 1 and body ground.

    Is there continuity? 

    YES:  Go to step  18.

    NO:  Repair open in the wire between the A/F sensor (Sensor 1) and the A/F sensor relay, then go to step  26.

    Fig 6: Checking Continuity Between A/F Sensor Relay 4P Connector Terminal No. 1 & Body Ground
    G05952864Courtesy of AMERICAN HONDA MOTOR CO., INC.
  18. Disconnect ECM/PCM connector A (49P).
  19. Connect ECM/PCM connector terminal A22 to body ground with a jumper wire.
    Fig 7: Connecting ECM/PCM Connector Terminal A22 To Body Ground With Jumper Wire
    G05952865Courtesy of AMERICAN HONDA MOTOR CO., INC.
  20. Check for continuity between A/F sensor relay 4P connector terminal No. 3 and body ground.

    Is there continuity? 

    YES:  Go to step  32.

    NO:  Repair open in the wire between the ECM/PCM (A22) and the A/F sensor relay, then go to step  26.

    Fig 8: Checking Continuity Between A/F Sensor Relay 4P Connector Terminal No. 3 & Body Ground
    G05952866Courtesy of AMERICAN HONDA MOTOR CO., INC.
  21. Open the fuse access panel (A), then remove the A/F sensor relay (B) from the under-dash fuse/relay box.
    Fig 9: Identifying Fuse Access Panel & A/F Sensor Relay
    G05952867Courtesy of AMERICAN HONDA MOTOR CO., INC.
  22. Remove the under-cowl panel. (see UNDER-COWL PANEL REPLACEMENT )
  23. Disconnect the A/F sensor (Sensor 1) 4P connector.
  24. Check for continuity between A/F sensor (Sensor 1) 4P connector terminal No. 4 and body ground.

    Is there continuity? 

    YES:  Repair short in the wire between the A/F sensor relay and the A/F sensor (Sensor 1). Also replace the No. 26 LAF (A/F SENSOR) (10 A) fuse, then go to step  26.

    NO:  Replace the under-dash fuse/relay box, then go to step  26.

    Fig 10: Checking Continuity Between A/F Sensor (Sensor 1) 4P Connector Terminal No. 4 & Body Ground
    G05952868Courtesy of AMERICAN HONDA MOTOR CO., INC.
  25. Replace the A/F sensor (Sensor 1) (see A/F SENSOR REPLACEMENT  ).
  26. Reconnect all connectors.
  27. Turn the ignition switch to ON (II).
  28. Reset the ECM/PCM with the HDS.
  29. Do ECM/PCM IDLE LEARN PROCEDURE .
  30. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0135 indicated? 

    YES:  Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay, and the ECM/PCM, then go to step  1.

    NO:  Go to step  31.

  31. Monitor the OBD STATUS for DTC P0135 in the DTCs MENU with the HDS.

    Does the screen indicate PASSED? 

    YES:  Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated in step  30, go to the indicated DTC's troubleshooting.

    NO:  If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay, and the ECM/PCM, then go to step  1. If the HDS indicates NOT COMPLETED, go to step  29.

  32. Reconnect all connectors.
  33. Update the ECM/PCM if it does not have the latest software (see ECM/PCM UPDATE  ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ).
  34. Start the engine.
  35. Check for Pending or Confirmed DTCs with the HDS.

    Is DTC P0135 indicated? 

    YES:  Check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step  35. If the ECM/PCM was substituted, go to step  1.

    NO:  Go to step  36.

  36. Monitor the OBD STATUS for DTC P0135 in the DTCs MENU with the HDS.

    Does the screen indicate PASSED? 

    YES:  If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT  ). If any other Pending or Confirmed DTCs were indicated in step  35, go to the indicated DTC's troubleshooting.

    NO:  If the HDS indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1), the A/F sensor relay, and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step  34. If the ECM/PCM was substituted, go to step  1. If the HDS indicates NOT COMPLETED, keep idling until a result comes on.

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