How do you replace a serpentine belt on a 2001 jaguar xj8?

To replace the serpentine belt on a 2001 Jaguar XJ8, first, ensure the engine is off and cool. Locate the belt routing diagram, usually found near the front of the engine or in the owner's manual, and then use a socket wrench to relieve tension on the tensioner pulley. Remove the old belt and carefully route the new one according to the diagram, ensuring it sits properly on all pulleys. Finally, recheck the alignment and tension before starting the engine to confirm everything is functioning correctly.