At your mileage I would change the front O2 sensor, the one closest to the engine in the exhaust manifold first. That is the O2 sensor that controls fuel mixtures.

 

Thank you for your response. I will do that. Funny you should mention the fuel mixture, because while monitoring my MPG (screen between the Speedometer and RPMs) it says I'm getting a much better MPG compared to before this issue.

I will replace the O2 sensor and report back. Thanks again for your help.

 

What codes does a code scan report? That is step one.

 

Did anyone ever solve this?

 

Mine was a precursor to an inefficient catalytic converter. I was surprised because I was expecting p0420. Sure enough, this year the intermittent p2097 stopped and i started getting p0420.

For a little history, I installed a walker cat about 5 years ago and sold my stock cat for $300. I was looking for some increased performance and the walker cat helped. Also turned out that my stock cat didnt look great either once I got it out (see video below).

I think your stock cats are on the way out. I fixed my code with a rear o2 spacer. You can use a spark plus anti fouler to move it out of the exhaust stream. Not legal but I am fairly certain my cat is intact and not clogged. Its just a cheap aftermarket part and the precious metal payload is lower and maybe soot is blocking the catalyst process. My oem rear cat is still in place too.