Similar issue on my 07 3.0si. Didn’t pass smog due to po420 and 430. I was going to install defoulers but there isn’t much room around the bank 2 sensors.

Going to try Cataclean to clean the cats to get it to pass smog test. It seems to be driving fine except I do smell a hint of oil being burned after a longer drive. No smoke or smell like a failed valve cover gasket though.

I’m doubting new sensors would fix my issue. I also had some oil on the connectors but the o rings kept the connection dry.

What tools did you use to get the bank 2 sensor that screws in vertically? I’d say it’s the left exhaust pipe.

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e70 - purchased 6/2018
e36 - wouldn't pass smog at 190k 2016
e53 - transmission blew at 225k 2012
e30 - sold as it was a little slow for a DD and burning oil at 220k 2011