U won't get a error code on a 91-93 SE-R for sure, unless its a cali spec model- then ya will get a EGR code. For me on my old SE-R I had no EGR at all, no emissions or anything and I had no check engine lights. Now 200SX will throw ya a code for sure- but I don't think this kit would work on a 200SX, not so sure. Mike Jez 01 Max 5spd.