To run through the 4-digit code data on your car, put the key in the ignition and turn to the 2nd position, where all the cluster lights come on. Within a second, tap the accelerator pedal (fully) 5 times in rapid succession (total time about 3 seconds). The check-engine light will flash once and then turn off. It will then flash a certain number of times, turn off, flash another number of times and then do it twice more. If there are other codes it will then flash these. For example.... "flash... flashflash... flash... flashflashflash" would be a code of 1213 (whatever that is). If your car is telling you certain codes, you can crossreference these codes online and see if they mean anything's wrong. You will need to know the exact year and engine in your car when you search for a code list, as they differ by engine. You could also buy a code reader for $100, but why...
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