O2 sensor question/info.

[IMDB]

I recently had some transmission work done and on the way home the SEL light came on. I read the codes po134 and po135 for B1 S1 which led me to think that sensor didn't get plugged in after the work. They re-checked the connection and cleared the codes. I left the shop and went to Sam's club to pick up some things and the light came back on. When I got home I checked the codes again and there was no codes and the light was off.
I pulled up the 4 O2 sensors to see what they were reading. B1 S1 .0430 to .0450 , B1 S2 about the same. B2 S1 .025 to .750 and B2 S2 about the same as bank 1 side. I've look on line and best I can figure out is this is normal. B2 S1 is the newer sensor with about 15,000 miles and the other sensors have around 80,000 miles. The last shop wrapped the b2 s1 wire around the front drive shaft and it took 3 or 4 hundred miles to damage the wires.
So do the other sensors need to be replaced?

 

[JBWJr]

Have you noticed any change in gas mileage?

 

[IMDB]

No, this just happened over the last few days. I looked at website again this morning and I think I understand that information now. I looked at it last night but my brain was tired.
I think there is a issue with B1 S1. All of the other sensors are ok. I have a new ntk sensor to replace it with. Here is a pic of B1 S1.

 

[Crochet556]

Sounds like you got it under control, but I’ve heard you might as well do both if you’re doing one.

Just did front 2 on my ‘02 Tundra. Make sure to soak those suckers in Pb or Kroil, I stripped one bung out and had to tap it. No fun

 

[IMDB]

OK, I have replaced the sensor. Took longer to find my tools that I needed than replace it but that's typical. When you change one do it when the engine is stone cold, put the O2 tool on and give a slight tap with a hammer.

 

[IMDB]

O2 sensor wire that was wrapped around front drive shaft.

 

[41mag]

Coating the threads of new sensor with a little “anti-seize” helps when next replacement comes . Just a thought.

 

[IMDB]

Yes, I used the anti seize that came with the new sensor.

 

[IMDB]

Well I made a circle around the block and the light came back on. Now B1 S2 isn't working. I'm beginning to think that the ground has been pulled loose. I have a manual that shows where the grounds are. It's a down stream sensor so it shouldn't hurt anything.