Which sensor off ECM?

Hey Guys,

Need help identifying dangling sensor off ECM wire bundle. Pics attached. Sensor runs to front lower ECM plug. TY for any help.

 

1999 Freighliner Century - Detroit 12.7 series 60.

 

Thank you so much for the quick reply! The harness does hang right at the front of the rear fuel filter and is long enough. I think I will get a new sensor, pull the plug out of the filter, and install the sensor. Threads appear to be same size. Thank you Sir!

 

Awesome reference, but I think it's for DDEC5. Gonna dive into it more later, but yes, the plug on the rear fuel filter housing has a plug, same size, I'm gonna try pulling and put a new sensor in. Thanks for the help figuring this out.