My 02 4.7L ram stalls after cold start and driving a block or 2 then will not stall again. It has a code (P0037) for a bad downstream (heated) Oxygen sensor. Parts store says I have 2 downstream, one left and one right, but my exhaust has only 1 downstream behind the one catalytic converter. Is this how the stock exhaust is on a 2002 4.7L? Exhaust looks like this one :

 

Probably the difference between federal, and california emissions.

 

Called another parts store and same thing, they say their system shows a left and right downstream and that I should have 2 of those and 2 in front of the catalytic. Will phone the dealer on Monday to see if they show the correct info for my 02.

My downstream has a crack above the screwed in part of the body so it wiggles with the wire slightly so I'm hoping changing it will get rid of the stall after driving from a cold start.

 

I would suspect that you would just need the right side sensors. Make sure the wire length is at least close though.