Diesel Exhaust Fluid Line
WARNING: This page is about a different car, the 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.
The Diesel Exhaust Fluid (DEF) line provides hydraulic connection between the DEF injection pump and the DEF injector. The DEF line is manufactured from a plastic material, which is specifically designed for use with DEF.
A copper based resistor wire is installed within the DEF line with an electrical connector. The resistor wire enables electrical heating of the DEF at low-ambient temperatures.
The DEF line has hardwired connections from the DEF heater control unit.