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Premium Member
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So far, you are describing the problems that come with the cable......take the letter to dealership when you go.

The primary code, P0171 relates to a vacuum problem often caused by a failed PCV disc.....this is part of the cam cover and the entire thing gets replaced....should be no issue with your ext. warranty.
If the pcv has failed, there is a proceedure the dealer is to follow to determine if the failure was caused by a stuck valve that is part of the intake manifold.....if stuck, the manifold, as an assembly is to be replaced.

At this rate, your warranty will have itself paid for in no time.

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