I replaced mine today with 141k on them. No lights or codes but figured it needed them replaced. I know you can't really tell much by appearances but here they are. I'm open for any comments as I'm curious as to how they looked.

Top to bottom: after the cat, driver's side, passenger side.

 

Bottom 2 look normal. Top 1 looks like its running RICH. Loota carbon build up. My .02

 

Do you think anything leans towards a partial and/or clogged cat? Yeah, the top one is after the cat.

 

The sensor after the converter does absolutely nothing that will affect engine performance. The only thing it does, is make sure the converter is working properly. If or when it detects a problem with the converter, it will set a DTC in memory, and turn the SES light on.

 

Thanks Captain!