If there is a fault Check Appropriate SensorĪn ECU reset will restore the car to factory default settings.Turn ignition OFF & Disconnect Connectors.If Code is OK then Turn ignition OFF & Disconnect Connectors.(scroll down to "Finding Those Connectors" section to help you locate them) It is possible to find which sensor(s) is faulty by following these steps: The ECU will then signal the driver via the Check Engine in the instrument console if there is a problem with any of the computers inputs. The stock ECU on a 92-97 Subaru Impreza can diagnose any fault that may arise that are sent from the various sensors in the engine bay to the electronic controller unit (ECU). All the details below would hep anyone Diagnose when their Check Engine light stays one and geared towards WRX, STI owners. All the below information is for the first generation Subaru Impreza, which is the pre-facelift model covering years from 1992 to 1997.
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