Located on top of fuel filter. This sensor is designed for the shorter version fuel filter and should not be used on the longer version filters.
It will not protrude as far into the filter body as the other unit shown below.
This is a fairly common failure item, which often causes the engine to go into limp mode. This sensor is often oil soaked with vapors from oil leak-by from the turbocharger, in the charge air stream . Carrying a spare sensor is suggested, as they are inexpensive and always seem to fail in the middle of nowhere.