1998xlt v6sohc O2 Terminology question PLEASE

[astrochimp]

Got error code read and the printout shows
P0153
o2 sensor
CKT Slow Response
Bank 2 Sensor 1


I know there are several o2 sensors, some are label upstream and downstream and have different parts numbers.

can Someone please explain Where this o2 is located and how I determine which part number to buy?

 

[astrochimp]

google searching hasn't given me many answers yet

 

[TedJ]

Upstream o2 sensors are before the catalytic converter, and downstream 02 sensors are after the catalytic converter. The upstream sensors are used for fuel management, and the downstream sensors are used to judge catalytic converter efficiency. The computer compares the upstream sensor value to the downstream sensor value, and sets a code if the catalytic converter is not reducing the emissions enough.

I believe sensor 1 is a upstream sensor, but i don't know what side that would be on.

 

[Turdle]

Driver side closest to the engine

 

[astrochimp]

Awesome

ThanksAlot