That is a good question. I assumed the bad sensors were the ones that install directly into the cat since that is what they replaced. I do not know the location of the other sensors to figure out if they were the ones that went bad.
The mechanic did mention the computer does use readings from these sensors to make corrections, but I assumed they were the same sensors that throw cel in other test pipe driven 370z's.
It very well could be a different sensor location, I assumed removing the cat, cat sensor destroyed.
From what I have read, the common code p0420 of cat efficiency low is normal and can be ignored. Since I don't even know the code I am throwing, and they deemed the sensors bad, I will just wait to have them installed and see what happens.
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