Adding EGR?

[Fast355]

Update,
I just wanted to add some information, so I don't forget.

2001 operating systems that I have found with EGR monitors in them
12202088
12208322

For 2002 I have found this operating system that does NOT have an EGR monitor in it.
12212156

I don't know if it is the operating system itself that has or doesn't have the EGR monitor in it, or if it is the calibration segment for the engine or engine diagnostics.
I would have to find a 12202088 or 12208322 WITHOUT an EGR monitor in it, or a 12212156 WITH an EGR monitor in it to answer that question I guess.
Maybe in the future I will come across one of these but if not then I might assume that there wasn't an EGR system monitor in 2002 due to changes allowing GM to skip installing an EGR system on them.

12212156 came with EGR from the factory. 2002 Express application.

[4pointslow]

12212156 came with EGR from the factory. 2002 Express application.

Thanks! Maybe I can test a Chevy Express Van BIN and see if the monitor shows just not ready as opposed to not available for the EGR monitor.