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Hi all, I installed LG super pros on my H/C/I C5 and I'm getting the P0133 and P0153 codes pretty regularly. I'm running the stock rear O2's in the upstream position. My headers have the 2000degF ceramic coating. I've checked for exhaust leaks before the collectors and have found none.
My car has 51k on the original sensors and I figure I should change them. I've searched through opinions on the different brands, but most of the threads are 10+ years old, and the designs have since changed. It looks like my options are: AC Delco, Bosch, Denso, and NTK.
I'd really like to hear if you have figured out how to cure these codes with the LG's.