My cars check engine light came on, went to autozone and they diagnosed it as a coil 3 needed to be replaced, ordered the coil and replaced, but light was still illuminated, got the same part and replaced it again, however check engine light remained on, took car to dealership where we were told I needed a new engine due to coolant leak and sludge build up, did not have the money to replace. This happened at approximately 126,000 miles