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Code 41 - Air/Fuel Learning Control

NOTE: Refer to illustration for ECU connector and terminal identification. See Figure .
  1. Check fuel injector operation and repair as necessary. See Codes 14, 15, 16, 17, 18 and 19. If injectors are okay, check airflow sensor (Code 23) and repair as necessary. If airflow sensor is okay, check coolant temperature sensor (Code 21) and repair as necessary. If coolant temperature sensor is okay, check throttle position sensor (Code 31) and repair as necessary. If throttle position sensor is okay, check both oxygen sensors (Codes 32 and 37) and repair as necessary. If oxygen sensors are okay, go to next step.
  2. Check system fuel pressure. See BASIC TESTING article. Ensure all fuel injectors are operating properly. If all components have been inspected and Code 41 is still present, check ECU connector terminals for good contact. Repair as necessary. If connector terminals are okay, replace ECU.
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