Hi! I hear people talking about rht-side upstream, and left-side upstream o2sens etc. but my dodge ram 2001 has only one cat conv. w/ only two o2 sens. And so it got me wondering if the oxygen sensors are specific to the upstream right and left and how I would order an o2 sensor for my 2001 dodge ram since it has only one cat. Would any upstream o2 sensor work correctly on my van, or do I need to specify a sensor for a single cat. vehicle. I hope it is not too confusing to understand. Thanks for any help out there. Frank

 

Sensors are quite likely the same left/right. I think the only difference on the rear is the length of the pigtail. NTK or Denso sensors only please, the other ones just don't work like they should.