I was driving and my MIL came on. When I parked, I could smell strong exhaust fumes. I went to get an OBD2 scan and it came back with P0420: Catalyst System Efficiency below Threshold (Bank 1) reading. I was told to replace the O2 sensor. After getting it replaced, this did not fix the issue. After some research, I discovered there is a TSB out recommending CATALYTIC CONVERTER inspection and/or replacement. However, it only applies to the 1.6L engine and not the 2.0L engine, which makes no sense. The dealership denied coverage because of this and the vehicle exhaust fumes are still strong. This can cause emissions issues later, so the TSB should be expanded to all Kia Soul models, regardless of engine size.