2004 JAGUAR S-Type AJ25/AJ27 (X200)

Engine identity

Oils and fluids

Service and parts data

Common and chronic problems

• Rear suspension bush wear causing noise
• TKI (timing chain tensioner) rattle on V6 engines under specific conditions
• Electronic throttle body faults

First checks

• Inspect suspension bushings and ball joints
• Check timing chain noise and engine codes
• Verify throttle body cleanliness and functionality

Before replacing parts

• Save fault codes and freeze-frame data before clearing anything.
• Check engine oil, coolant and transmission fluid using the correct temperature and service procedure.
• Verify power, ground, connectors, hoses, leaks and live data before replacing expensive parts.

Important notes

• The S-Type 2004 model was largely unchanged externally from its 1999 launch but included updates to engine management and minor refinements.
• Diesel variant primarily offered in European markets; petrol V6 and V8 widely available globally.