HO2 Sensor replaced and still showing a code

[bchatchett]

Hi all,

I recently threw P0051 and P1168 on my 07 Pathfinder 4x4. I replaced Bank 2 Sensor 1 since that is what the code pulled and had Autozone clear the code. Code showed cleared and got about 2 miles down the road and the SES light popped back on. Code was again P0051 and P1168. Any ideas?

[Rev_D21]

Umm, perhaps the o2 sensor wasn't the problem? Did you test anything or just start throwing parts at it?

[cruzad3r]

i'm having the same issue on my dad's qx4 - error code p0141 B1S2 O2 sensor malfunction - the rep at autozone stated it's the right o2 before the cat by the header. so i bought the same exact part and swapped it out. clear the code with my obd II. thought everything was set until today my dad said the frikin MIL came back. so i scan, erase the code and took it for a ride. so far it has not come back but i'm not sure if it's going to change in the morning.

my question is - is the B1S2 O2 locates before the cat on the passenger side (right side) or the rep at autozone is giving me false information that made me swap out the wrong O2? anyone can confirm this? please? thanks

[bchatchett]

No, I connected the old and the new sensor to a meter and the old one was dead and the new one was showing as good.

[cruzad3r]

can anyone help a brother out? where the hell is B1S2 O2 on a 99 QX4? Thanks