Engine light comes on sometimes, after driving a few miles after car sat all night. light did not come on .car sat for a few hours restarted and drove the light came on

You might try to take it to autozone if you have one in your area they can run a check on your vehicle an give you an idea what the problem is why your check engine light is coming on as there are many things that could be causing this problem sounds like a sensor but they can pin point the problem for you im sure plus its a free check let me know if this helps you.