Diesel Exhaust Fluid (Def) Tank

WARNING: This page is about a different car, the 2018 Jaguar XE and 2017 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.

The Diesel Exhaust Fluid (DEF) tank unit is blow molded from High Density Polyethylene (HDPE). The tank is located under the left side rear wheel arch panel and is secured to the wheel arch panel by a bracket and four fixing bolts. The DEF tank is shield protected by the rear left wheel arch liner. The DEF tank unit contains the DEF supply module which is welded into the tank, and supplied as a unit. The tank includes a 12% unusable volume to protect the internal components as a result of fluid expansion under freezing conditions.

If the ambient temperature falls below -11 °C (12 °F), the DEF will freeze in the DEF tank, this will provide difficulty with the refill procedure. In order to thaw the DEF in the DEF tank, place the vehicle in a warm place for up to 2 hours before attempting to refill the tank.

When the vehicle consumes more DEF than anticipated, for example extended vehicle use in extreme temperatures, 'at high altitude' or aggressive drive cycles, a warning message will be displayed in the Instrument Cluster (IC) message center to add DEF to the tank.