Whether your vehicle is showing obvious signs of a problem or you noticed the “check engine” light is on, a quick car diagnostic test by an expert technician can help pinpoint the problem. How A Car Diagnostic Test Works The diagnostic test relies on a computer system that links to the vehicle's computer processor, sensors, and microchips, logging any problems or issues present. It can reveal existing flaws including problems with the exhaust, transmission, oil tank and other systems. A Car Diagnostic Test Identifies your Automotive problems A car diagnostic test provides a quick and accurate assessment of your vehicle. Technicians will scan your vehicle's onboard computer, document any diagnostic trouble codes, and check for service notifications issued by your vehicle's manufacturer. If necessary, a technician will perform a road test or visual inspection to help verify the issue. Sometimes a comprehensive battery and charging system analysis or other tests will be necessary to identify other issues troubling your car. The Value of a Car Diagnostic Test Diagnostic tests help pinpoint issues quickly and reliably, without need for a full vehicle inspection. If you’re short on time, these tests can help identify next steps to get you safely back on the road. Check Engine Light On? It's Time for an Engine Diagnostic If you already have a check engine light on, it’s best to take your car to your local Meineke Car Care Center and let a certified technician diagnose and repair the issue.