back passenger o2.......right?
so, I have been getting these since the replacement of all 4 o2's.
have chased the wires and found nothing amiss. next? bad o2? I got the bosch.

what to check, now?

 

Yes it is a problem with the back passenger o2.

1) Switch the rear o2's and see if the problem moves banks. If it moves it's a dead sensor

2) I would check the connector for that sensor very close to make sure the pins are not bent or covered in oil. Then I would check all of the pins at the ECM to make sure nothing got pulled out and the pins that are supposed to have power are getting power. The exhaust emission control is on connector 2 of the ECM and here is the section of the RAVE that should show you which pins to test.
O2 sensor info..pdf

3)If everything checks out good at the ECM then I would replaced that sensor with a new one.

4) If it still doesn't clear the codes then I would suspect a bad ECM.
Similar issue:
Questions about O2 sensor codes P0160 & P0161

 

Is your new o2 still under warranty?
-Might be worth your while to swap it for a new one to make sure you just don't have a faulty o2.

Also, do you still have your old one?
- When my o2's code I just pull it and clean it with some MAF sensor cleaner and it runs good again.

 

thanks all. hoping for a dicked up new 02.
had the p0161, once, a few month ago. cleared and never returned. I popped in the 4 new ones and drove around for about 100 miles....and now this.

I will swap and see what happens.

 

btw
problem solved. swapped sensors and problem remained. upon closer inspection of the connector (truck connector) a pin was displaced from the harness, not bent, but pulled loose (brush induced injury, i presume)
shoved it in, epoxied the wires to the connector, and all is well.
till the next "f " up.......thanks

 

I was thinking- prolly just a fuse. oh well...

 

yep. my first thought too.