CAMARO6 - View Single Post - Stainless Works Cat-back exhaust and error code P0420 '16 2SS M6 non-NPP. any ideas?

MrChrisLS3 · 09-17-2016, 01:49 PM

Do you still have the stock system. It might be worth it put it back on and let the dealership take another look. I can understand their point, before mod, no issue, after mod there's an issue. Hard to say if it's related or not at this point.

09-17-2016, 01:49 PM	#4
MrChrisLS3 Drives: 2018 1SS M6 Join Date: Nov 2014 Location: Houston Posts: 2,617	Do you still have the stock system. It might be worth it put it back on and let the dealership take another look. I can understand their point, before mod, no issue, after mod there's an issue. Hard to say if it's related or not at this point.