Fuel cap engine light not turning off after repair

I don't think the check engine light was reset, he just said the problem would most likely be my gas cap. ( I think he was right because I've been having a problem closing the gas cap. ) After I got it replaced he just told me to drive the car until the check engine light goes off. If I would need to re-set the engine light, how would I do that?

Disconnecting the battery negative cable for 5 minutes will do it - however that really isn’t the preferred procedure due to loss of radio station presets and idle speed re-learn will have to be completed again - which the control module will do during next trip. Ideally you need to find a friend with a code reader that can reset the light simply by hooking it up and pressing the correct button. Some-one you know has this device. Your ‘mechanic’ should have done this for you in the first place !!!

Thank you, I disconnected the battery for 5 minutes but the engine check light is still on so it may be a different problem, any suggestions?

Find a friend with a code reader and get the exact code numbers then post them here. Advance Auto or AutoZone will do this also - for free. I need the code numbers!