Post by
NolimitZ32 »
https://forums.nicoclub.com/nolimitz32-u100070.html
Mon Sep 20, 2021 7:37 am
NO clue, my car is completely gutted of all emissions and custom tuned. Never had to deal with it. Its likely that the OBD uses resistance to test for presence of the system. You may need to read up on it and play with a few different resistors in line. IF you still have the EGR valve, test the resistance through the contacts and try to emulate it or try plugging the valve back in and clearing the codes to see what it does. It could be using the O2s to measure EGR efficiency and when it doesn't see a change in the gas mixture when the EGR is supposed to be operating its throwing a code. This is uncharted territory for me in the practical sense so it's all theory.