Question: The warranty for our 2010 Kia Rio was up at 75,000 miles. At 79,000, the engine light went on and we had the dealership check the problem. It turned out that three of our coils went bad. Could you please explain how important these coils are and if this particular car brand has problems with it?
— E.H., Chicago
The coils that failed are the ignition coils. There is one for each cylinder and they create the high voltage needed to make the spark plugs spark. So, yes, they a
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