2003 Jaguar XJ 4.2L Petrol · MW53 OLC

The 2003 Jaguar XJ presents a stable and improving mechanical picture, culminating in a clean pass on 27 November 2025 at 68,035 miles with zero defects. This is a significant turnaround from the preceding 14 months. The vehicle failed on 8 November 2024 at 63,465 miles for degraded suspension ball joint dust boots on the nearside front upper arm and offside rear rod, alongside both front tyres worn to the legal limit. A retest on 28 November 2024 at 63,497 miles passed, but still flagged both front tyres as worn close to the legal limit, indicating the suspension boots were addressed yet the tyres were merely borderline. By the October 2023 test at 60,307 miles, an ABS warning lamp and an inoperative engine MIL were flagged on the initial attempt, but these electronic faults were resolved before the same-day pass. The trajectory from repeated advisories and failures in late 2023 and late 2024 to a completely clean bill of health in late 2025 shows a clear improving maintenance trend, with previous owners actively rectifying flagged defects. The mileage profile tells a story of very light use. Across roughly 23 years, the vehicle has covered 68,035 miles, averaging approximately 2,958 miles per year. The record shows a notable jump of 3,190 miles between the October 2023 test at 60,307 miles and the November 2024 failure at 63,465 miles, representing a single year's driving. However, the subsequent 12-month interval to the November 2025 pass at 68,035 miles added 4,538 miles, a marked increase in annual usage. This recent uptick in mileage accumulation after a period of minimal use is worth noting, as components like suspension bushes, brake seals, and tyre rubber can deteriorate from age and standing rather than purely from wear. A buyer should focus the physical inspection on the front suspension and braking system. The repeated failure and advisory for front tyre wear, specifically worn on the edge, points to a persistent alignment or suspension geometry issue. While the tyres were replaced or deemed legal for the 2025 test, a fresh inspection of the nearside front upper suspension arm ball joint and its replacement dust boot is essential to confirm the repair's longevity. The history of an ABS warning lamp and an inoperative engine MIL, even though cleared, warrants a diagnostic scan to check for stored fault codes. Given the low annual mileage and the potential for long periods of inactivity, a thorough check for corrosion on brake lines, the exhaust system, and structural subframes is advised, as standing vehicles can trap moisture and accelerate decay.