Check Engine Light flashing is serious. You need a scantool to retrieve codes stored in the computer in your car. If the Check Engine Light/Service Engine Soon light illuminates while you are driving, the car's on board computer sees a fault in the engines management system that is causing an excess amount of pollutants to be emitted from your car. This could result in engine damage if left neglected. Some problems that can cause the Check Engine light to stay on may take two "drive cycles' to complete before illuminating the Check Engine Light. The computer sees a problem and looks for an identical set of circumstances to occur to confirm that it has indeed seen a problem before turning on the light. A Check Engine light that continually flashes while you are driving is serious and is a sign that the computer sees a problem that seriously risks damaging the catalytic converter which may result in an expensive repair or even may cause a fire! Diagnostic codes are stored in the vehicle's computer and can be retrieved using a scantool that communicates with the computer in your car. We have in our Repairpal website an encyclopedia with in depth articles about computer, and computer control systems, emission and driveability problems. http://repairpal.com/check-engine-light
my check engine turned on recently and just today started flashing on a 2006 grand prix. the problem is that i recently cleaned the injectors, changed my plugs and cables, and tested the coil (and came out as good). I took it to a local autozone and their computer says its a misfire on two cylinders. what could be causing this?
MY CHECK ENGINGE LIGHT IT FLASHES THEN STAY ON ,IT ALSO START UP VERY ROUGH THEN SMOOTH IT SELF OUT , I CHANGE WIRE PLUGS CORE PACK AND THE CAMSHIFT POSITION SENSOR WHT ELSE COULD IT BE I HAVE 2005 KIA SPORTAGE,SOME ONE PLEASE HELP