2000 Jaguar XJ 4.0L Petrol · X621 ANC

The Jaguar XJ presents a stable roadworthiness profile in its most recent MOT cycles, with no defects recorded in the December 2025 tests despite two consecutive failures—both occurring within a week at 118,242 and 119,430 miles. The December 2025 pass at 119,433 miles suggests the issues prompting the earlier failures were addressed promptly, as no advisories or defects were logged in the final test. This pattern indicates a vehicle that has been kept mechanically sound in recent years, though the repeated failures without recorded faults raise questions about what exactly caused the initial rejections—potentially minor but non-compliant items like lighting, fluid leaks, or minor corrosion that were corrected before the retest. The mileage accumulation is unusually low for a 26-year-old vehicle, averaging just 4,594 miles per year, which implies either infrequent use or prolonged periods of inactivity. The gap between the 2023 test at 114,908 miles and the 2024 tests at 118,242 miles suggests roughly 3,334 miles were covered over 12 months, a pace that would preserve suspension components, brakes, and drivetrain wear but may also mean seals and fluids have degraded slowly. The lack of mileage progression between the two 2024 tests (both at 118,242 miles) is particularly unusual and could indicate a clerical error or a period where the vehicle was not in regular use. For a buyer, this low-mileage history is a positive for long-term component life but should prompt scrutiny of fluid condition and potential neglect in less visible areas. Given the clean MOT history in recent years, a buyer should prioritise a thorough inspection of components that are not routinely tested but are critical to long-term reliability. The suspension—particularly the rear coil springs, anti-roll bars, and bushings—should be checked for wear or sagging, as low mileage can mask gradual degradation. Binding or uneven brake performance should be tested, especially if the vehicle was driven infrequently, as moisture ingress can lead to corrosion in calipers or brake lines. Structural integrity is another key concern; despite no recorded corrosion in the MOTs, the Jaguar’s aluminium bodywork can still suffer from hidden rust in wheel arches or sills, so a close examination of these areas is essential. Finally, while the MOTs show no defects, the repeated failures without explanation suggest the previous owner may have addressed issues just before testing, so a pre-purchase inspection by a specialist should verify no deferred maintenance exists.