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system does trim on the rear 02 sensor
you would have to look in scan data to confirm this
most cars manufatcured after 2003 DO trim on the rear 02 sensor.
you can look in the Mode 6 test results
look at the test limits and the test result - test results should not be anywhere near test limits
if you have a scope
the 02 sensor should switch in 100ms or less , that is 10 times in 1 second
at 2k rpm hot with no load
must cycle from 150mv to 850 mv in 100ms or less and back in 100ms or less
does it ?
is it an AFR sensor or an 02 sensor ? how many wires ?
best answer is
if it aint broke - DONT FIX IT .
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