check engine light went on

[BeeMain]

went on this morning on the way to work. Temp, fine. didn't run out of oil, so that's fine, brakes/abs work, lights and all that work.

it's really wet and slushy here and I hit a pot hole, could it be something with the O2 sensor?

How do you reset it with out going to a garage?

Is there a way to get a code by turning the key? I could do that with my Jeep, I'd turn it 3 times and it would flash a code.

thanks