I'm pretty sure i know the answer already but thought i'd ask just in case. My 07 LBZ was throwing the po402 code (excessive egr), so i put in an EGR blocker plate. Now i get the po401 (insufficient egr). I do have the FE9 code in the glovebox but it apparently doesn't matter on this truck. Since i don't want to put a programmer on it, a fingerstick is my only solution correct? The truck is 100% stock other than the blocker plate and lift pump.