LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Honda >> 2004 >> Element DX, 2.4 YH2, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> PGM-FI System >> DTC Troubleshooting >> DTC P2A00: A/F Sensor (Sensor 1) Circuit Range/Performance Problem
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
  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:
    • ECT SENSOR 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 55 mph (88 km/h) and 75 mph (120 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 terminals 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:
    • ECT SENSOR 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 55 mph (88 km/h) and 75 mph (120 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.
scientia non olet · About LEMON Manuals