Ok so in addendum to this thread i swapped out the bank 1 o2 sensor which is the one i was getting a code thrown for. The Z reacts a little more quickly to throttle inputs now, but i am still getting the hesitation i described before, do all o2 sensor both upstream and downstream need to be replaced in order to resolve this issue? Also in addition to the hesitation I noticed that the coolant temps are getting pretty high, like around 215 or more...could this be caused by the o2 sensors as well?
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