Check Engine Light Diagnosis & Testing near Waterbury, Connecticut

A professional will connect a diagnostic scan tool to read out the diagnostic trouble codes stored in the vehicle. They should check every system in the vehicle as the light can be illuminated from other things like the transmission or ABS system. There can be numerous codes stored in the computer for days, weeks or months so it's important to identify the code that is causing the light to illuminate. The computer can store additional data like when the code was set, how many times it was set, and the sensor reading at the time it was set. All this info is used to start the diagnostic process. Can manufacturers release information called Technical Service Bulletins that may shine a light on why a code was set. Professional mechanics will always check these before diving too deep into any issues that caused the light to come on. Depending on why the code came on, mechanics will test out the sensors or other items like the injectors, fuel pump, spark plugs or just about any other part on the engine. Once a failed part is identified the mechanic replaces the part, resets the trouble codes then drives the car to verify the issue has been resolved.