The Jaguar XJ (XJ40) model, produced from 1986 to 1994, represented a significant evolution for Jaguar's flagship luxury sedan. Known for its distinctive, clean-sheet design by Geoff Lawson, the XJ40 competed in the premium executive market against established rivals. It featured a range of refined AJ6 inline-six engines, available in displacements from 2.9L to 4.0L, paired with either a ZF 4-speed automatic transmission or a less common Getrag 5-speed manual. The XJ40 was engineered to offer a high level of comfort, sophisticated handling, and advanced technology for its time, including computer management for engine and transmission systems, and optional features like anti-lock brakes and traction control.

This comprehensive Workshop Repair Manual / Service Manual, presented in eight printed volumes (three service, five repair), provides detailed guidance for maintaining and repairing the Jaguar XJ40. It covers all major systems, including engine mechanicals and management, automatic and manual transmissions, drivetrain, suspension, steering, brakes, electrical systems, climate control, fuel, and cooling systems. The manual includes scheduled maintenance procedures, extensive troubleshooting guides with diagnostic trouble codes, and step-by-step instructions for component repair and overhaul, ensuring owners and technicians can effectively preserve the vehicle's performance and longevity.