This morning, when I started my 2005 X5 4.4i, the "Service Engine Soon" light started blinking immediately after I started the engine. The engine made a strange noise and ran very roughly for about 10 seconds.

I shut down the engine and checked the oil level and checked under the vehicle for leaks. The oil level was fine and no leaks. I also checked the gas cap to confirm it was on tight. It was.

So I started it back up. It ran fine, but the Service Engine Soon light remained on -- this time the light was solid, not blinking. None of the other idiot lights (such as oil pressure) are on. The temperature gauge is in the normal range.

I decided to drive it to work (only 1.5 miles). It drove fine -- no loss of power, smooth as ever. But the light remained on.

The service interval lights are still in the "green" range, so it isn't telling me that its time for a normal service visit.

I called my Service Advisor. Got her voice mail and left her a message, but haven't heard back.

Anyone else experience anything like this before?