2005 Jaguar XJ 4.2L Petrol · SC54 AXH

The most recent MOT test on 14 October 2024 resulted in a Pass, but it was accompanied by five advisories that warrant careful consideration, and it came only three days after a Fail on 11 October 2024 which itself produced a Major defect for excessive rear wheel bearing play. Looking at the broader pattern, the maintenance trend is best described as stable but ageing rather than worsening, as the vehicle is passing its annual tests but accumulating a steady stream of corrosion advisories, suspension wear items, and minor oil leaks across consecutive examinations. The Dangerous defect recorded in October 2022 for a leaking offside rear hydraulic brake caliper and contaminated brake components was resolved before the subsequent pass, and the engine management warning light issue flagged as a Major in October 2023 has likewise not reappeared, suggesting those repairs were effective. However, the recurrence of ABS ring corrosion, brake pipe corrosion, sub-frame corrosion around the mounting bushes, and persistent oil leaks over consecutive tests indicates ongoing deterioration rather than rectification, which is characteristic of a high-mileage luxury saloon of this vintage. With 136,265 miles recorded over approximately 21 years, this Jaguar XJ has covered an average of roughly 6,489 miles per year, which is broadly typical for its age and usage profile. There are no obvious extended gaps in the MOT record, suggesting the vehicle has been in regular use rather than left standing for prolonged periods, although the relatively modest annual mileage means some components may be subject to calendar-based degradation as much as wear. The repeated advisories relating to corrosion on underbody components such as the sub-frame, brake pipes, and ABS rings are consistent with a car that has been driven consistently in all conditions over many winters, exposing the underside to road salt and moisture. A thorough physical inspection and test drive should focus closely on the items that have been flagged repeatedly. The rear wheel bearing play recorded as a Major in October 2024 must be confirmed as rectified; on the road, any humming, droning, or rumbling that varies with cornering loads would indicate further bearing wear. The advisories concerning the rear ABS sensor rings contacting due to corrosion underneath are a concern, as continued corrosion can lead to erratic ABS operation or warning lights, so the reluctor rings and sensors should be visually examined for fresh rust scale. The rear sub-frame corrosion around the front mounting bushes, while not currently classed as seriously weakened, is a known weak point on XJ models and should be inspected closely for any cracking, distortion, or movement when the vehicle is rocked on a ramp. The brake pipe corrosion along the offside front to rear run by the floor pan and the corroded ferrules on the rear brake hoses both suggest the hydraulic system is approaching the end of its service life, and any spongy pedal feel, fluid seepage, or visible weeping at joints would warrant immediate attention. Further checks should include a careful listen and feel test of the rear brakes, as the October 2023 advisory noted a nearside rear caliper feeling slightly stiff to rotate with heat signs and disc pitting, which can lead to uneven braking, dragging, or judder under pedal application. The front lower suspension arm pins and bushes flagged in October 2022 should be inspected for any slack, as worn bushes will produce clonking over speed humps, vagueness through corners, and uneven inner-edge tyre wear. The persistent front-of-engine oil leak should be monitored by checking the underside for fresh drips and the oil level on the dipstick, as Jaguar V8 engines of this era are prone to timing cover and sump gasket seepage that can escalate. Given the vehicle's age, a prospective buyer should also verify the condition and age of the 12V battery, request evidence of recent cambelt or timing chain service if applicable to this engine variant, check the tyres for age-related sidewall perishing regardless of tread depth, and confirm that coolant, brake fluid, and automatic transmission fluid have been refreshed on a calendar basis rather than purely mileage. Headlamp lens deterioration noted in 2023 should be checked for further haze, and the registration plate lamp should be confirmed operational. A diagnostic read of any stored fault codes would also be prudent given the 2023 engine management light episode.