Radio Frequency Interference Suppressor
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.
Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC
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The Radio Frequency Interference (RFI) suppressor is installed on the engine harness carrier at the rear of the engine. The suppressor is connected into the power supply from the ignition relay in the rear Engine Junction Box (EJB) to the ignition coils.