I brought my wife's 2012 accent in for service because the horn had quit working and we were hearing valve rattle during acceleration. The horn was fixed, but there was nothing done about the valve rattle. It was recommended we do a fuel system treatment for $150 that did nothing for the valve rattle. I think this money should be refunded. While there were no diagnostic codes there is an audible problem with this vehicle and it still needs to be resolved.
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