Are spark plugs part of a powertrain?
After diagnosing a check engine light, a mechanic said my 06 Sedona has a random misfire and needs spark plugs. I have 86,000 miles and 4 years on this car. I know the 60,000 mile warranty is gone, but the 100,000 mile warranty only covers something called a powertrain. I don't know what spark plugs do and I don't know what a powertrain is. Are spark plugs covered? Also, do I have to take it to a Kia dealer in order to use the warranty? Also, how many spark plugs does my Sedona have and should they all be replaced or will they be able to tell which ones need it? What might this cost if it's not covered? I have owned cars for 20 years and have never needed repair work, sorry if this is a dumb question.