Why does my Check Engine Light come on? The check engine light comes on when there is a fault in the engine emissions system. There are many reasons why it could come on. When your Check Engine Light is on your car is telling you something is wrong with it. It is best to get your Check Engine Light checked out as soon as possible. If your Check Engine Light is flashing that means the Catalytic Convertor in your car is going to damaged if you keep driving your vehicle. When your Check Engine Light is on an OEM level scan tool, or the OEM scan tool will need to be hooked to your car’s diagnostic port to retrieve the Check Engine Light codes. We retrieve the codes from your vehicle and look up the testing process in Service Information. The testing procedure needs to be followed step by step to reach the proper analysis and that could be anything from a sensor that has failed and sending the wrong information to the engine ECM to a broken wire. Sometimes it may be as simple as performing an update to your car’s ECM. If your Check Engine Light is on, bring your vehicle to us and we would be happy to help you get your car running correctly again.