Check engine light comes on 2004 Honda Pilot

check to see if the gas cap is on tight then have the engine light reset

I don't believe your doing any damage

You need to replace the cap, but first take Vaseline and rub on the rubber seal on the cap. Where it connects to the fuel fill nozzle. This is the cheap fix and will solve most air leaks. Also make sure once you do this to turn cap until you hear three clicks.

I did a diagnostic on my Honda pilot 2003 the code read p1456 how I repair the problem