Hey,
Well i had some pieces laying around with an old K&N filter so i threw it on my 02 S2000. I drove around it was fine than the next day when i started her up for work the CEL came on. After work i went by Autozone to check the code and was told it was Seconday Air Injection? Well i installed it correct and all hoses are routed the right way. Kinda confused why it came on most likely i will take it off just cause i dont like seeing it on. LMK if you have guys have an idea on the reason it came up on maybe ? thanx peace

 

check the hoses right under the TB...theres two small vac hoses that you might've switched.

 

Check those and check the little white check valve for correct direction. (second pic in this forum : https://www.s2ki.com/forums/index.php?showtopic=105368)

 

hoses reversed

 

 

i didnt touch any of the hoees i only pulled the breather an put it back in the intake and i put the thick rubber hose thats connected to the oem intake into the 2nd hole on the intake. I didnt unplug or reverse anything? i also though our cars had IAT sensors in the intake like obd-2 civics an integras?

 

Maybe you could post some detailed pics of the intake and the hoses that do attach to it.