REV MATCH SYSTEM PROBLEM, EMISSIONS SYSTEM PROBLEM

[typermode]

I know KTuner will show me the code, but how do I get the code?
Via laptop or will I find it via V2 display?

[typermode]

okay, found the code P0420.
I have AEM cold air intake, AWE track exhaust, and PRL catted DP.

I cleared the code to see if it comes back.