Today every car is controlled by a computer. The steering system, fuel injectors, spark plugs, and much more are all told when they are needed and when to move by a computer system. Having a computer inside of your car offers you the ability to know what is wrong instantly. When you see a check engine light appear you should immediately take your care in for Engine Diagnostics. Petty's Automotive has techs that have ASE training and know how to properly fix your automobile.