Greetings. '96 LX. Popped a P0420. Crammed a leaf blower up the tailpipe. Defintely have a leak BETWEEN cats 1 & 2 at the gasket. Does a P0420 indicate a leak BEFORE cat 1 or can a leak between cats 1 and 2 trigger that code? I certainly wasn't going to run out and buy a new catalytic converter or 02 sensor before checking for leaks after popping this code. I’ve got 2 videos below. One shows the bubbling and the second one shows my live O2 sensor voltage readings. I'll be honest, I'm not sure what I'm supposed to be seeing on the voltage readings except that they should not be the same. The O2 sensor video is of the engine revving lightly up and down while in Park. Thanks!