So I can't seem to verify the correct part name of an O2 sensor I need to replace. On the exhaust diagram its labeled as "Right Bank Heated Oxygen Sensor (FRONT). On a parts page O2 sensors are labeled as up-stream, down-stream, and right/left. Can anyone verify a part # or the correlating part name. I am 99% sure its Denso part # 234-4741, but would just like to double check before ordering.

 

Front = upstream
Rear = downstream
Right =passenger
Left = driver
That is the correct Denso part # you have for the front/passenger position.

Densos are a bit more expensive, but worth it for the longevity.
I just replace all four on my '02 Monty.

Dousing the old sensor threads with PB Blaster multiple times over the course of a couple of days helps heaps before the removal day.
Using a 22mm open end wrench worked a treat.
Tapping the end of the wrench with a hammer helped break the sensor free.
Be careful of the downstream driver sensor (the one in the cat.) The female threads in the cat. can get mangled easily. If you do need to retap the treads it's an 18mm/1.25 tap.

Good Luck