Little help please

Installed a cold air intake on my 02 2.7. There's a vacuum hose that went into the airbox across the radiator shroud into a little piece on the driver fender. I just unhooked it from airbox and left hose open and dangling by windshield washer jug. Now I'm getting a check engine light. What does it do and how can I fix?

 

Just a homemade one pieced together. Basically a adapter that fits into end of MAF and a cone filter.

 

So no one knows what that hose does?

 

it is the purge for the vapor vent system
it shouldnt throw a code

you should buy a simple code reader to find out what the code is. Autozone $60 , also allows you to clear the code

my bet would be that there is a code for the MAF

I would just cut my losses and hook it back up to stock intake , there is no advantage to derestricting the stock air filter