Front Passenger Floor Heating up - Bad catalytic converter?

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My 19 month old accidentally hit enter before I could finish my post.

After replacing the sensor I drove with the check engine light on for all quite a while. It was at this point I noticed one occasion that the cat overheated on a long drive. It didn’t happen again for many months after. Then this weekend on a camping trip it was overheating almost the entire drive. This leads me to believe that bank to censor one is causing a bad fuel mixture and dumping excess fuel into the exhaust which is combusting in the cat.

I learned only then from a friend that I forgot to reset the ECU when I replaced the sensor many months ago. I did a reset, but the problem still occurs and the check engine light came back on. What’s really interesting though is that the new code is P0135 which is bank one sensor one, the driver side, not the passenger side.

Does anyone know if a bad bank one sensor can affect the fuel mixture going to the bank two side of the engine? I’m hoping it is a simple as replacing bank 1 sensor 1.
If you have a hot floor, you have an exhaust issue. So you might not hear a leak, but have one, or you might have a cat getting too hot. I'd invest in a cheap pyrometer and check the temps for sure when it is doing it. Until then, you are just guessing.
 
If you have a hot floor, you have an exhaust issue. So you might not hear a leak, but have one, or you might have a cat getting too hot. I'd invest in a cheap pyrometer and check the temps for sure when it is doing it. Until then, you are just guessing.
Thanks. We can rule out the exhaust leak because the issue is intermittent. There are days, weeks even, when the issue does not occur. On our drive home this past weekend the issue went away about 2 hours into our drive, but came back again a mile from home an hour later. If it were an exhaust leak it would be a constant issue. I know the hat is coming from an overheating cat (or two). I do wish to know if it is one or both cats overheating (this is where checking temps would come in handy), and if a overheating cat could cause damage to nearby components like the transmission or transfer case. My problem is figuring out what's causing it as I'm not getting any codes other than the O2 sensor codes I mentioned above.

After making sure all my O2 sensors are in good shape I will investigate if I have any non metered air leaking into the intake through a bad gasket as ClassyJalopy mentioned above. But since I'm not getting any codes for that I'm hopeful this could just be an O2 sensor issue. I'll also clean my throttle body and mass air flow sensor while I'm at it, it can't hurt.
 

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