O2 sensor bad after snow

Came back from Reno this past weekend. I was in the snow. And my truck began to sound weird. As if I have a vacuum leak someplace. Or as if my air filter was not connected to my intake.
It finally threw a Check engine light.
And this is the code it threw.
I read up on it and it should be driver side post cat.
Is this correct?

2006 tacoma sport

 

Also at low speeds before shifting into 5 gear at about 40mph my truck begins to shutter. I'm guessing it's my transmission.

 

Don't deem sensor bad because you got a code for it. Look at the sensor and connections visually and then post your results.

 

I looked at them. There a little muddy. I don't see anything broken or foreign. Everything is plugged in.

 

Is the sensor still tight and sealed in the pipe post cat? Your description makes me think rust has gotten the better of the pipe, bung, the sensor is loose, or there is some sort of significant exhaust leak in the area.


http://www.customtacos.com/tech.old...06toyrm/06toypdf/06rmsrc/rm2006ta/0050026.pdf

 

Yea everything was tight I just went out and bought one. Figured I had the money and maybe I was stressing over something that's nothing. But we'll see if the code comes back. Cleared it and reolcade bank 1 sensor 2
But I can still hear the vacuum leak sound.

 

Exhaust leak maybe...

 

If it was indeed an exhaust leak where and how could I find ii

 

The most common point is at the attachment flanges. where there is a doughnut gasket.

Crank it up and crawl under and inspect each flange for leaks.

 

Ok I'll try that today.