Haven't had a problem with my 02 X5 but had the Service Engine Light Soon come on on my 02 525. They gave me the same crap that it was the Gas Cap. BS! It went away without any intervention. I also had a horribly rough idle and loss of power with about 8k miles on it. Had to have it towed just to find out a Tech had broken a connector and didn't tell anyone. Replaced it and haven't had any problems since!

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2008 ///M5 - Black Sapphire Metallic/Black Perforated Merino/Madeiro Walnut trim/6-spd Manual
2005 X5 4.8is - LeMans Blue/Black Nappa/Anthracite trim | born 05/20/05 - For Sale
2003 ///M5 - LeMans Blue/Black Interior/Aluminum trim/6-spd Manual - retired
2002 525i - Jet Black/Black Sport/5-spd Manual - retired
2002 X5 3.0i - Sterling Gray Metallic/Tan Leather Sport/5-spd Manual - retired