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Is there any way you could have the vehicle scanned for trouble codes? Most parts stores will do this for free.
Are there any symptoms? Runs funny? Stalls?
Yeah, Napa might do it.
Being that it only has 31k miles I would probably have the dealer fix it under warranty regardless of what it turns out to be, but it's always a good idea to go in there with an understanding of what's wrong so they don't take you for a ride.
I think NAPA scans codes for people. I'm not sure though.
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