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Home >> Acura >> 2003 >> RSX Base, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> PGM-FI System >> DTC Troubleshooting >> DTC P2270, P2271: Secondary HO2S (Sensor 2) Circuit Signal Stuck Lean (2005-2006 models); Secondary HO2S (Sensor 2) Circuit Signal Stuck Rich (2005-2006 models)

DTC P2270, P2271: Secondary HO2S (Sensor 2) Circuit Signal Stuck Lean (2005-2006 models); Secondary HO2S (Sensor 2) Circuit Signal Stuck Rich (2005-2006 models)

  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 176°F (80°C)
    • Vehicle speed at 35 mph (56 km/h) or more
    • Drive 20 seconds or more
  5. Monitor the OBD STATUS for DTC P2270 or P2271 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 secondary HO2S (Sensor 2) 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 secondary HO2S (Sensor 2) (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. 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.
  12. Test-drive under these conditions:
    • Engine coolant temperature above 176°F (80°C)
    • Vehicle speed at 35 mph (56 km/h) or more
    • Drive 20 seconds or more
  13. Check for Temporary DTCs or DTCs with the HDS.

    Are any Temporary DTCs or DTCs indicated? 

    1. YES -  If DTC P2270 or P2271 is indicated, check for poor connections or loose terminals at the secondary HO2S (Sensor 2) 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 14.
  14. Monitor the OBD STATUS for DTC P2270 or P2271 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 secondary HO2S (Sensor 2) 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  11 and recheck.
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