You should get the problem code ran at a shop or auto parts store. My moms 2003 Toyota Echo check engine light came on and it had a slight misfire, I replaced all the sparkplugs about $20 and no check light.
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I have the same exact problem with my 2002 Echo. Just a couple of weeks ago the engine light came on even though everything seems just fine. I took the car for an oil change the day after the light came on and the guys put a scanner on it and determined that the problem was with the gas cap. One of the guys tightened it a lot and the light went off for a couple of weeks. But, a couple of days ago it came back, so I bought a new gas cap from Canadian Tire, however, the engine light is still on. Perhaps there's something special about the Toyota cap...luckily I kept it. I'll put it back on and tighten it a lot and hopefully that will get the light to go off. Then, perhaps that will reset the sensor and I'll be able to put the new cap on without the light coming back on.
Replacedd gas cap light on dash stiill indicates gas cap loose
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