Factory OE Nox Trap Temperature Sensor or Nox Sensor.
Fits 2011-2012 6.7L Powerstroke.
A NOx adsorber or NOx trap (also called Lean NOx trap, abbr. LNT) is a device that is used to reduce oxides of nitrogen (NO and NO2) emissions from a lean burn internal combustion engine by means of adsorption.
Ford part number: BC3Z-9D378-G (or BC3Z9D378G)