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My check engine light has been on. I had it checked by my mechanic and was told no codes showed up. This morning the check engine light started blinking.

  • If there is a check engine light, the car should have set some codes – Zaid Feb 27 '17 at 15:28
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Shut the car off! A blinking check engine light can quickly destroy an engine. Possible causes include leaking fuel injector, broken ignition coil/wire/spark plug.

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If the car is working perfectly fine. Could it be that you did not tighten the gas cap when you refilled? It looks like this is a very common problem. You may even need a new gas cap.

See this for more info: Check engine light is on, but no codes?

I would go to a different mechanic next time. :)

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