My 1998 Tahoe with an L31 has the post cat O2 and EGR removed. Now I get the SES light every time It is fully warmed. About 2 miles.
Codes are P0161 and P0401. I went into navigator and disabled P0137-141, P0157-161, and P0401-405. All of the EGR and sensor 2 DTC's.
I also set the enable speed for the EGR test to 256MPH.
Still getting the codes every time.
Is it possible that my MPV12 is BS'ing me and will only do disables on P01 (0411) or later PCM's? That's my suspicion.
Or am I not doing something IDK about? I saved all the settings, I think, before removing the HPT device.
It's fully licensed for the truck.
1GNEK13R6WJxxxxxx
serial 86CCSF##72538HQY
OS 16263425
Black box PCM serv# 16228015
1998 Tahoe