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It probably just needs new plugs/coils. Most misfires are due to this. If it's persistent cylinder 5 I'd replace all the plugs first (likely can get this done as part of your 30k service), if you keep getting a cylinder 5 misfire, get the code stored and then de-mod it and take it in and let them replace the coil.
On the other hand, the coils are only 40 bucks.
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2008 E92 335i MT |