Radio Frequency Interference (RFI) Suppressor
WARNING: This page is about a different car, the 2015 Jaguar XF, 2014 Jaguar XF, and 2013 Jaguar XF. However, it is still accessible from the selected car via links, so may be relevant.
The RFI (Radio Frequency Interference) suppressor is installed on the engine harness carrier at the rear of the engine. The RFI suppressor is a capacitor which absorbs the electrical interferences. The electrical interferences are induced by the working of the coils and spark plugs. The RFI suppressor is connected into the power supply from the ignition relay in the EJB to the ignition coils.