So, I've been working on figuring out this code for the past week or so...

Bank 1 Sensor 1 not switching.

What I've done so far:
Replaced every vacuum line.
Bought 2 (AcDelco) sensors.
Cleaned MAF sensor.

Connections all look fine, however I don't have the tools to test them.

Background: I just had my transmission rebuilt 3 times by a very non reputable shop. Obviously, I didn't know when I first dropped it off...As soon as I got it back from them the second time, I got the code. I replaced the sensor and all was well. 3 months and 4 days later, I had to drop it off again and again was greeted by the code when I picked it up. Pulled the sensor, replaced it even though it had no deposits on it and looked damn near brand new. Ended up just replacing bank 2 sensor 1 with it... Code went away for 5 miles and has been there ever since.

I'm thinking my next step would be to check for an exhaust leak, maybe they left out a seal when they dropped it to take out the trans? Basically at this point just looking for what they broke.

Any help and opinions would be really appreciated.

 

Not sure why you made a new thread

Oxygen Sensor / Vacuum Leak

But did you go thru the whole link I gave ya ? also did your hvac get fixed?

 

Honestly, I couldn't find it again. I wont know about the HVAC until it gets below freezing again. It's been 40+ here for the past 2 weeks.

I did check out the link, but I'm trying to figure out the most probable solutions...Idk.. I talked to a tech at a party the other night and he said it could be anything from the fuel pressure regulator to a leak in the upper plenum to a dirty MAF sensor. It seems like like I need a scanner to really pin-point the problem.