hey guys im a young tech im working on garbage trucks at the moment and we are seeing a lot of the newer trucks having this same code po42200 catalyst 2 efficiency below threshold (bank 1) and we are not sure why these codes keep popping up weve sent the trucks to ballard mack and when the trucks come back the code will come back on within a day or two so my question is has anybody seen this or dealt with this and has any pointers on fixing the issue causing the code and where to start weve tried cleaning the cat filter replacing the filter checked and cleared all lines in the system and nothing has working thank you for reading and thanks in advance for any pointers and advice
