Diesel Exhaust Fluid Injector

WARNING: This page is about a different car, the 2018 Land Rover Range Rover, 2017 Land Rover Range Rover, and 2016 Land Rover Range Rover. However, it is still accessible from the selected car via links, so may be relevant.

The Diesel Exhaust Fluid (DEF) injector is located in the exhaust system downstream of the Diesel Particulate Filter (DPF). The DEF injector is secured to the S-shaped exhaust pipe with a clamp. Due to the position of the injector, the DEF is injected axially to the exhaust gas flow direction. The DEF is then mixed well and distributed evenly within the exhaust gas. The DEF injector consists of an injector and a passive cooling heat sink, this protects the injector from overheating due to the high exhaust temperatures.

The DEF injector works at high pressures to obtain the complete atomization of the injected DEF. This provides the Selective Catalyst Reduction (SCR) catalytic converter is working to its optimum performance. The DEF injector is controlled by the Powertrain Control Module (PCM) with Pulse Width Modulation (PWM) signals.