Getting the code, generic code reader, 2x in the last week. Not sure if it is from driving it gently or hard!! I have done this week!

I have headers and 200 cell cat. So I am guessing the post cat O2 is seeing too much flow. If that is the consensus, I will just get an extender for the post cat O2 and move it out a little bit.

What say the gurus here?

Thanks!

Regards,
Jerry

 

There's a good chance you are correct, don't know how long you've had that setup, but if the voltage readings were close to spec, even a weather change can throw it off just that much more or less so that it's out of spec.
At the very least, any extender is a cheap experiment for your problem.
Good luck