Traverse 2018 evap and catalytic problem need help

[Hasan]

Hi I own 2018 traverse high country and I have a big problem I don't know how to solve I have the codes P0420,P0442,P0446,P0496 .. I bought a used charcoal canister and its added the code P0449 when I return the old vent solenoid to the new charcoal its return to only 4 codes

I replaced the purge valve twice and it get bad within days

And now the car is unstable especially after brake and I feel it can't go fast easily

 

[zora]

You should be chasing the P0420 code before the others. You may have a clogged cat. Read this link and check the other codes on this site.

P0420 Catalyst System Efficiency Below Threshold

How to diagnose, repair, and info on symptoms and causes of a P0420 engine code which means the catalytic converter is no longer performing at a normal level.

www.obd-codes.com