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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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