My car has been having trouble starting for the past 2 weeks. So I finally dropped off the car at the dealer on tuesday to find out whats causing this issue. I have a brand new battery in the car. When I dropped off my car they told me they will diagnose the problem and if its not warranty covered item then I have to pay $99 diagnostic charage. The only after market thing in the car is double din sterio (no amp or subs), HID lights and Viper 791XV. Can any of those things avoid the extened waranty?