Where is the aftertreatmnt intake NOx sensor on Cummins ISX?

Hi there, I have a 2013 Cummins ISX KW T660 that's getting code SPN 3216 FMI 4, which is
Aftertreatment 1 Intake NOx
Voltage Below Normal, Or Shorted To Low Source

I'm guessing the sensor is shot. Anyone know the location of it?

thanks!

 

First time I called the dealer they couldn't find it, probably because he was looking in the engine component category. I'll have to call in the morning and try again and tell him to look in the aftertreament components. Unfortunately I can't get my hands on the truck to look at the part.

I'll post up a part number when I get it.

 

That would be awesome - then the parts guys can find it a lot easier! I know the inlet and outlet sensor are similar except the plugs are keyed differently for some reason...

2013 Kenworth ISX 1XKAA48XXDJ363341

 

Is that a newer part or is that different than 3687334RX? I was looking at a manual that lists 3687334RX is Figure 19