Land Rover Diesel Exhaust Fluid / Def Cap LR078768

The Diesel Exhaust Fluid (DEF) Cap, OEM part number LR078768, is located on the DEF reservoir of selected Land Rover models, including the Range Rover and Discovery series with a 3.0L V6 diesel engine. This critical component ensures proper sealing of the DEF tank, preventing contamination and loss of fluid necessary for the selective catalytic reduction (SCR) system. Common issues that may necessitate replacement include damage from external impact or wear from regular use, which can lead to fluid leakage and, ultimately, diminished emission control efficiency. Alternative terminologies include Filler Neck Cap and Cap - Filler. This cap is compatible with the 2016-2021 Land Rover Range Rover, Range Rover Sport, and Discovery. Additional part numbers include LR071851, LR092720, and LR161843.