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The check engine light turns on to inform the driver that the computer has detected a 'fault' and that the driver should address the problem. If the light is on constantly, it's considered a "minor" fault but something that needs attention as soon as you get a chance. If the light is flashing it means that something serious has been detected and you need to deal with it NOW!

Unfortunately there is a whole class of "faults" that clear themselves and don't show up until next time the problem is detected... and it may not be until you go 65mph.

You may need to connect the diagnostic code reader to the vehicle then go for a drive. You should be able to have someone with you so that one of you can drive while the other is operating the code scanner.

That kind of problem seems like a pain but usually they aren't too bad once you have the code scanner helping you.

It can also be a problem with OTHER systems, such as the anti-lock brakes. If that's the case you'll need to take the vehicle to a dealer or a brake specialist.

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Q: I cut off the car the ck engine light goes off a doesn't come back til I go over 65 mph It run fine I had it check they didn't find anything but the check engine light still come on it doesnt stay on?
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