1998 L31 Can't turn off post cat and egr

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. :banghead:
It's fully licensed for the truck.

1GNEK13R6WJxxxxxx
serial 86CCSF##72538HQY
OS 16263425
Black box PCM serv# 16228015
1998 Tahoe

It's still popping the check engine light or just appearing when you pull the codes?

The later computers allow me to unselect the SES box, haven't looked at a black box file in a while to see if it's the same.

Everything needs to be set to No Error Reported and the SES box needs to be unchecked. From memory the black box is the same. I have disabled almost everything on a couple of PCMs used on non road going applications. One was a fan boat with a TPI run by a black box and the other a rock climbing buggy with a 4.3L from an Astro van.

Thanks, I'll give it another try.

It's popping the SES light after about 2 miles. It's never on at startup, but comes on as soon as it warms up on the highway.