so i installed my aem cold air intake into my 99 civic coupe ex today, but the check engine light came on afterwards.

i asked my friend about it, he said i had to take the ecu out and put it back in.

i didn't unplug my battery when i installed the intake; could this be the problem? would unplugging the battery and putting it back in solve this?

what other things could this be?

this is the only thing i've done to my engine; i just needed to clear the way to install strut bars and things until i get a new engine.

thanks for your help