new to the forum. I just got a 2008 Prius with 200k for a really good price. The car drives great. However it throws the p0420 previos owner told me her mechanic said the front exhaust pipe is the catalytic converter need to be replaced. The code goes off and they after a while comes back and then off again. Still has the original cat. What’s the best route to fixed this issue. I’m planning on keep in the car for a while. Pretty comfy ride honestly I love it. Thanks in advance guys iPhone ?