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The single most common cause of the SES light is the gas cap being loose. It can be cross-threaded, or just not tight, and if it doesn't seal there is a fault due to the evaporative emissions system controls sensing a leak. Any chance the vehicle was refueled the day the light came on, or the day prior?
Check the gas cap, tighten it up, and see if the code goes away within a day. It won't go out immediately, but it will self-reset. If not, book it at the dealer.
If it isn't the gas cap, it is more likely to be a sensor than anything internal in the engine.
Good luck.
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2007 X3 3.0si, 6 MT, Premium, White
Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue
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