I Had the airaid intake and never had a service engine light. The sensor on the gas cap is checked every (so many) 15 key cycles. (cant remember the numbeer) but it should go out if all is okay. Probably just a coincidence.
If not, call airaid and ask them, as well.
I think I took mine off after two weeks or so. I didn't like the brush and water getting directly to the filter thru the engine compartment.
Good luck.
