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Home >> Acura >> 2009 >> TSX Standard >> Repair and Diagnosis >> Engine Performance >> System >> PGM-FI System (4-CYL) >> DTC Troubleshooting >> DTC P2A00: A/F Sensor (Sensor 1) Range/Performance Problem

DTC P2A00: A/F Sensor (Sensor 1) 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 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. Test-drive under these conditions
    • Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
    • A/T in D, M/T in 3rd
    • Vehicle speed between 25-55 mph (40 - 88 km/h) for 5 minutes
    • Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds, then decelerate (with throttle fully closed) for 5 seconds
  5. Monitor the OBD STATUS for DTC P2A00 in the DTCs MENU with the HDS

    Does the screen indicate FAILED? 

    YES  -Go to step 6

    NO  -If the screen 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 ECM/PCM If the screen indicates EXECUTING, keep driving until a result comes on If the screen indicates OUT OF CONDITION or NOT COMPLETED, go to step  3 and recheck

  6. Turn the ignition switch to LOCK (0)
  7. Replace the A/F sensor (Sensor 1) (see A/F SENSOR REPLACEMENT )
  8. Turn the ignition switch to 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 (ECT SENSOR 1) above 158 °F (70 °C)
    • A/T in D, M/T in 3rd
    • Vehicle speed between 25-55 mph (40 - 88 km/h) for 5 minutes
    • Drive at a steady speed between 55-75 mph (88-120 km/h) for 10 seconds, then decelerate (with throttle fully closed) for 5 seconds
  12. Check for Temporary DTCs or DTCs with the HDS

    Is DTC P2A00 indicated? 

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

    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? 

    YES  -Troubleshooting is complete If any other Temporary DTCs or DTCs were indicated in step  12, go to the indicated DTC's troubleshooting

    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 or NOT COMPLETED, go to step  11

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