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Service Engine Soon

Discussion in 'E63/E64 (2004-2010)' started by knightwill, Jun 21, 2008.

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    I have a 2006 650i cabriolet. Almost since new, the Service Engine Soon light periodically comes on. Often it comes on for maybe 50 miles after a new tank of gas, then eventually goes out. I try to use highest octane fuel, usually 91 in our area. I make sure I securely close the gas cap. The dealer recomended both. These do not seem to help. Any ideas?
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    Are you "topping off" the tank? I have read that if you overfill the tank beyond the point where the fuel pump's automatic shut-off activates that you will get the service engine light. This used to happen to me on my 1999 740i so now I just fill the 650 until the fuel shut-off at the pump (okay, maybe I squeeze in a bit more to get to a round number sometimes!) Good luck!

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