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A flashing CEL can be caused by a multiple of things. Could be:
Ignition coil has failed
Fuel injector has failed
Engine computer has failed
Spark plug
Spark plug wire
Bad engine valves
We need more info to determine the issue. A durametric will give you codes related to the issue, very helpful, but you still need to check specific system and auto parts to find out the reason. Or you can delete the codes and see if the light goes out. Normally the light would go out, but it doesn't mean the problem is fixed as the light will come back again.
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