Service engine soon light??

[zaimer]

My service engine soon light has been coming on this past couple of months. I took it to the dealer, and they charged me a hundred and something dollars to do a complete "test" . Conclusion: guy said I either had bad gas or it may be due to my "aftermarket air filters", which were in there when I bought the car. The intake itself is oem, but i guess the box filter is aftermarket. I find it strange that the light is just coming on now when I've had the car since January. The tech said the car detected that it was running lean at one point, causing the light to come on.

I usually rest the light myself, but it comes back on after a few hundred miles..sometimes more. It is back on today and I am supposed to be back at the dealer Wednesday morning.

Any idea what is going on here? I've read several times on the forum our cars have a history of issues with the gas cap. I was thinking maybe replace that and see what happens