2006 Honda CR-V EX, 2.4 RD6FACTORY OEM SERVICE PROCEDURE

DTC P2A00: A/F Sensor (Sensor 1) Circuit Range/Performance Problem

  1. Turn the ignition switch ON (II).
  2. Clear the DTC with the HDS.
  3. Start the engine. Hold the engine speed at 3,000 rpm without load (in Park or neutral) until the radiator fan comes on, then let it idle.
  4. Test-drive under these conditions:
    • Engine coolant temperature above 158 °F (70 °C)
    • A/T in D position (M/T in 3rd gear)
    • Drive the vehicle between 25 mph (40 km/h) and 55 mph (88 km/h) for 5 minutes.
    • Drive at a steady speed between 25 mph (40 km/h) and 55 mph (88 km/h) for 10 seconds, then slow down with the throttle completely closed for 4 seconds.
  5. Monitor the OBD STATUS for DTC P2A00 in the DTCs MENU with the HDS.

    Does the screen indicate FAILED? 

    1. YES -  Go to step 6.
    2. NO -  If the screen indicates PASSED, intermittent failure, system is OK at this time. Check for poor connections or loose at the A/F sensor (Sensor 1) and the ECM/PCM. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step  3 and recheck.
  6. Turn the ignition switch OFF.
  7. Replace the A/F sensor (Sensor 1) (see A/F SENSOR REPLACEMENT  ).
  8. Turn the ignition switch ON (II).
  9. Reset the ECM/PCM with the HDS.
  10. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
  11. Test-drive under these conditions:
    • Engine coolant temperature above 158 °F (70 °C)
    • A/T in D position (M/T in 3rd gear)
    • Drive first the vehicle between 25 mph (40 km/h) and 55 mph (88 km/h) for 5 minutes.
    • Drive at a steady speed between 25 mph (40 km/h) and 55 mph (88 km/h) for 10 seconds, then slow down with the throttle completely closed for 4 seconds.
  12. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    1. YES -  If DTC P2A00 is indicated, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step  1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
    2. NO -  Go to step 13.
  13. Monitor the OBD STATUS for DTC P2A00 in the DTCs MENU with the HDS.

    Does the screen indicate PASSED? 

    1. YES -  Troubleshooting is complete.
    2. NO -  If the screen indicates FAILED, check for poor connections or loose terminals at the A/F sensor (Sensor 1) and the ECM/PCM, then go to step  1. If the screen indicates EXECUTING, keep driving until a result comes on. If the screen indicates OUT OF CONDITION, go to step  10 and recheck.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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