I must tell you that yesterday I had my ignition coils replaced - all 8 of them. I cost a little under 1000 dollars. They also replaced my spark plugs. This is insured for a year. I didn't take it to the dealer but had I taken it to the dealer - the labor would have been thru the roof. When my car was under warranty I was having them replaced as they went out. They said that according to my warranty they couldn't replace them all. But the guy at the shop yesterday said, it's usually better to replace them all because you will be constantly repairing them. And that could get expensive.