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We had engine malfunction reduced power warnings with our 08 535xit. Three or four attempts to correct...HPFP replaced, injectors replaced. All was good, and then the sunroof exploded unexpectedly. That, plus a bad speaker and bad seat sensor, and we'd had enough. BMW bought it back and replaced it with and 09 that has been just about perfect knock on wood.
We are having a problem with our 535 as well.
What specific problems have you had with your BMW?
What has your service department told you what the problem was?
Are you filling your tank with non-ethanol gas and is it making a difference?