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No. 6: Faulty ignition coil(s)
Average repair cost: $236.32
Replacing the ignition coil or coils (some cars have more than one) accounts for 3.69% of the repairs in this year's study, down from fifth place last year.
Ignition coils can malfunction due to high under-hood temperatures and the overall age. Pay attention to problems, as ignition-coil failures can cause other problems, including the pricey catalytic converter.