[mjg]

can anyone tell me how many upstream and downstream oxy sensors are on a 2012 Ram Laramie 2500 w/Cummins 6.7 diesel and where I can find diagrams showing where they are?
Are there any other sensors in the exhaust system that are not oxygen? Thank you

 

[Zaan]

can anyone tell me how many upstream and downstream oxy sensors are on a 2012 Ram Laramie 2500 w/Cummins 6.7 diesel and where I can find diagrams showing where they are?
Are there any other sensors in the exhaust system that are not oxygen? Thank you

You will have Nox (Nitrogen oxide) sensors which are similar to O2 sensors before, after, and possibly mid on the exhaust DPF and DEF injection system along with 3-4 temperature sensors.
Unfortunately I no longer have access to any diagrams that might be helpful.