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did a rear main in a 5.3. got it all back together & it’s running rough, codes say o2 sensor bank 2 sensor 2 circuit low but the mV is going up & down like it should. but B1S2 & B2S1 mV got up to 475 then both dropped to about 20 mV. all wires looked good.
to sum it up, the o2 that seems to be doing what it’s supposed to do is setting a code & the sensors that looks like their not doing what their supposed to do, are not setting a code
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