O2 failure help

[ccool91]

A few months ago I had my transmission replaced. Since then I had a cel for bank 2 downstream o2 sensor. I've since replaced it and the CEL is still on after clearing it a few times. I recently had to replace some bushings and while I was down at the shop they ran the CEL with a their tool and it shows that both my rear o2 sensors aren't changing. They are both frozen at 98-99ish. The reading of their level didn't change at all. So we went over the wires and everything touched during the transmission replacement and it all looks dandy.

The codes I'm getting now are for the two sensors not working and an ECM code.
Any help or information would be greatly appreciated
Thanks for your time

 

[dkyleb]

Did you replace them with OEM sensors?

 

[catrains]

the down stream O2 sensors have to shift in output at a much slower rate than the upstream O2 sensors.

the upstream sensors vary quickly just like a ac voltage feeding your home. so if the downstream sensors mimic the upstream this means the cat converters are dead .

things to do 1, post all CEL codes. 2, get the O2 output wave forms of these O2 sensors .. with that then it can be analyzed and determined that it is a converter failure or perhaps the fuel trims are really off etc...

a high output voltage on an O2 sensor means a too lean condition ..

exhaust / intake manifold leaks ???????????

 

[2003-4x4runner]

You should replace all the other O2 sensors. I had the same issue and when I replaced all the other sensors the CEL never came back.

Also, do you have a V8 or V6 and how many miles do you have.

 

[ccool91]

Codes are the following
P0157
P0158
P0157 P
P0158 P
P0606

I believe they changed since the last time I scanned it
The details on the vehicle are 2006 v6 4wd 134000
Thanks again for any information