Thanks for the detailed update. I was going to mention the readiness system, but you now know about it. Some good info on the internet if you search. It is a good thing if you can get to understand how the monitors run under specific conditions, and in a certain order. It is also good to understand about "Pending" codes.
A trick I used for many years on customer vehicles with P0420 was to run all monitors EXCEPT the catalyst. At the time, in New York, the vehicle would pass with one monitor not set to ready, so the inspection would pass. I am not sure if this loophole still exists, as it based on Federal guidelines. Maybe a local shop can tell you about this. If the loophole has closed, there is another simple trick to legally sneak through with a failing catalyst. Also be aware that as the weather gets warmer, the catalyst efficiency increases, so you may have the catalyst test naturally pass as Summer approaches.
After you clean the EGR system, see if the P0420 still sets. Try to keep the fuel tank level between 3/8 and 7/8 full to allow the EVAP. test to complete.
2014 SH-AWD TECH
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