02 sensor out can this fail my smog check

that is not the OEM makers statement on P0401.
truth is this. V6 engine? 3.3L and 3.5L???????
o2 sensor circuit no activity detected bank 1 sensor 2)
means the right rear 02 sensor reads dead.

right bank down stream 02 is dead.

and has zero to to with rich or lean, it is the rear sensor 2.
the rear sensors are only to this bank1 CAT for good quality.
not told at all , what engine is there. v6 sure,3.3 or 3.5L
nor how the engine runs and car drives. ?
or if this is ONLY a smog question and check engine lamp glows?
causes of 401 are
wires to right rear 02 cut burned or damaged , loose or fell off 02.
bad o2 B1,S2 rear of cat bad
bad CAT bank1,
exhaust cracks in CAT sucking air and making any 02 sensor to read dead, near it.
this post ASSUMES , no other DTC errors stored or live running,
assumes scanned LTFT PID reads correctly and no B1S1 02 errors.(front sensor)
bank 1 or B1 is right front engine bank. (drivers view)
facing engine is left bank. (workers viewed)
ASSSMEs car is driven plenty not just parked in an old barn.
A DRIVEN CAR !

SMog tests fail too for monitor cat bank1 dead.
or incomplete status on bank1 cat.

Engine should be normal operating temp. Replace o2 sensors

If check engine light is on. Get it scanned to find the problem code. They will do this at any auto parts store for free, It may be a bad 02 sensor. Get it scanned. A vehicle can fail a state-mandated smog test because a bad, or faulty, oxygen sensor. remove the O2 sensor from the exhaust pipe ahead of the catalytic converter and look for a change in performance. Good-Day!

Check or replace O2 sensor; scanned fault codes in order to know aditially what other sensor could be failed.

i would point to the actual fuel pump when they go weak they cannot supply enough fuel and it will miss and set o2 faults fuel filters usually cause a jerking under a load and will lose all power

if the engine computer says that you have a slow O2 sensor what it means is that the sensor does not react as quickly as it should and it needs to be replaced. nox is oxides of nitrogen, a product of too lean combustion which causes cylinder temps to go too high. it sounds like replacing O2 sensor will make it happy. engine computer is having a hard time controlling lean/ rich fuel mix because sensor is slow to register changes, needs to have response time in milliseconds or engine computer can't operate properly. O2 sensors do wear out, normal service item. hope that helps

yes

Tune it up and replace the 02 sensor that keeps setting the codes bank 2 sensor 1. Have your oil and filter changed right before you go for a retest to. That will clear up 3 codes P0300, 0155 and 0154. You might have to replace the fuel sending unit to get rid of P0463 but if the gauge works OK I'd leave it alone.

nox is from running lean..... its realy high temps that cause this.......... replace the o2 sensors this should cure that any more help let me know

Check the oil level, to much can ruin catalytic converter. Check O2 sensors with scanner, make sure they are work accurately. Check air box while car running, apply aceteline gas with no flame, recheck scanner for O2 sensors flucuatation. Compare all sensors for flucuation of 1mv to 9mv. If sensors flucuate they are good, if no flucuation sensors need to be changed. recommend to change cat with bad sensors. Before changing cat check for bad pressure.