O2 sensor location

[Elk_hunter]

Hi all,

I got trouble code p133 which is "upstream o2 bank 1 sensor 1" , I know that is the one of the passenger side before the cats, My ? is I only see 3 02 sensors on my 96 4.0 xlt.

There is one on the drivers side off the exhaust pipe. then the only one I see on the passenger side is on the exhaust pipe right before the 2 pipes meet. Then one after the last cat?

Is the upstream 02 bank 1 sensor 1 the one right before the two exhaust pipes meet?

thanks in advance for ya help

 

[RedBeard]

Here's the poop:

Bank 1 is the side of the engine as cylinder #1. Bank 2 is the other side of the engine.

Sensor 1 would be the most forward sensor on a particular side.

Do a search, I've seen this before in better detail.

-RB