2002 CRV warning light
 

The engine warning light went on after a fillup. Sure enough the gas
cap was loose. I tightened it many turns. But that was 50 miles ago.
The car has been used for at least 10 short drives, and the light is
still on. Shouldn't the light be off by now? Maybe it's something
besides the gas cap. Any way to get the codes from a Honda? TIA