I just bought a 2008 535i ,and when i start it up the seat belt light goes on so i connect the seat belt and then a red triangle with a question mark goes for a few minutes and then goes off. It's a auto -trans and it runs great. It has 54,000 miles on it so i was wondering if it's a service reminder for the cabin filters, or a number of things that need service at 50,000 miles.

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in the owners manual it should tell you what the different lights in the dash mean and or you can get them online. You should also have a maintenance schedule book outlining what service work is done at 50,000mi

- Nick