So I have a CEL being thrown from P0420. I already patched the ROM to set everything to pass but I still have the CEL light. I wanted to know if I could just edit the periphery settings to get rid of the CEL so I can get inspected tomorrow. Can I just change the periphery0(FAA) rear02 (bit1) to 0 and periphery(FCA) p0421(Bit1) to 0. I have not upgraded to Tephra and am just using the regular ROM image from the car.

Thanks !!