Jaguar Xj MOT Failures
An analysis of 110,053 real DVSA MOT tests on the Jaguar Xj — what fails, how often, and how that compares to every other car on UK roads. Generations covered: XJ40 (1986–1994), X300 (1994–1997), X308 (1997–2003), X350 (2003–2009), X351 (2009–2019).
Where the Jaguar Xj fails its MOT
The single biggest MOT failure point on the Jaguar Xj is suspension ball joints worn — this model is 270 times more likely to fail on this item than the average car on UK roads. That makes it an extreme outlier for anyone buying or owning this model. Across 110,053 MOT tests, 2.64% of all Jaguar Xj tests recorded this as a failure.
Suspension failures typically mean worn bushes, drop links, or dampers. These affect handling and tyre wear. Budget £150–£400 per corner at an independent garage for full suspension overhaul.
Other notable weak points include headlight fault (107x the fleet average), transmission joint, belt or chain worn (78x the fleet average), track rod ends worn (59x the fleet average), and abs fault (69x the fleet average). These ratios compare the Jaguar Xj's failure rate on each item against the national average for all cars tested — a ratio of 10x means this model fails ten times more often than a typical car.
The failures span 6 categories: Suspension, Lights & Electrics, Bodywork, Steering, Brakes and others. If you're inspecting a Jaguar Xj before purchase, these are the areas to focus on — and if any have been flagged as advisories on a previous MOT, they're likely to become failures in the near future.
How failures change with mileage
The Jaguar Xj's weak points shift as the car covers more miles. Understanding these patterns helps you know what to expect — and what to budget for — at each stage of ownership.
Under 60,000 miles
At this mileage, most failures are either design-related or caused by age rather than wear. Components like bushes and drop links may not have been replaced yet, and original-fit parts can deteriorate even on low-mileage cars that spend a lot of time sitting.
For the Jaguar Xj specifically, the DVSA data shows the most common failures at this mileage are suspension ball joints worn (270x the average) and anti-roll bar links worn (112x). suspension joint dust cover missing or no longe... (111x) and vehicle structure corroded to the extent that t... (103x) also appear frequently.
60,000 to 100,000 miles
This is where routine wear items start to show up. Brake components, tyres, and exhaust parts have done serious work by this point. Cars that have been well serviced will show fewer of these failures — this mileage band is where good maintenance really separates the well-kept from the neglected.
For the Jaguar Xj specifically, the DVSA data shows the most common failures at this mileage are suspension ball joints worn (209x the average) and transmission joint, belt or chain worn (78x). brake hoses perished or damaged (54x) and abs fault (30x) also appear frequently.
Over 100,000 miles
High-mileage cars accumulate failures across multiple systems. The key question isn't whether things will need doing — they will — but whether the car has been maintained well enough to keep on top of them. Look for a consistent service history and recent MOT passes with minimal advisories.
For the Jaguar Xj specifically, the DVSA data shows the most common failures at this mileage are suspension ball joints worn (117x the average) and fluid leak (109x). floor deteriorated or insecure (74x) and headlight fault (59x) also appear frequently.
Known issues beyond the MOT
An MOT only tests roadworthiness at a single point in time — it won't catch developing faults, intermittent problems, or issues that haven't yet reached the failure threshold. These are the issues that Jaguar Xj specialists and owners flag most frequently, drawn from manufacturer technical bulletins, workshop data, and verified owner reports.
Structural corrosion reducing rigidity (X300/X308) Dangerous
The steel monocoque structure on X300 and X308 XJs suffers from corrosion that can compromise structural integrity, particularly around suspension mounting points and sill sections. Affects X300, X308; typical independent garage repair cost is £2,000–£5,000.
Subframe mounting point corrosion (X300/X308) Dangerous
The prescribed areas within 30cm of subframe and suspension mounting points are particularly vulnerable to corrosion on steel-bodied XJs. Affects X300, X308; typical independent garage repair cost is £1,500–£3,000.
Wheel bearing wear (all generations) Major
XJ models show exceptionally high wheel bearing failure rates across all generations, with MOT data showing failures at over 90 times the fleet average. Affects XJ40, X300, X308, X350, X351; typical independent garage repair cost is £200–£400.
Power steering system malfunction (X300/X308) Major
Hydraulic power steering systems on X300 and X308 XJs suffer from pump failure and fluid leaks at nearly 28 times the fleet average failure rate. Affects X300, X308; typical independent garage repair cost is £400–£800.
For the complete picture — including repair costs across independent, specialist, and dealer garages — see the full Jaguar Xj common problems breakdown.
What to check before buying a Jaguar Xj
Based on the MOT failure data and known issues above, here's what to prioritise when inspecting a Jaguar Xj:
Suspension — check for suspension ball joints worn, abs fault. Lights & Electrics — check for headlight fault. Bodywork — check for transmission joint, belt or chain worn, structural corrosion. Steering — check for track rod ends worn.
Beyond the MOT items, ask specifically about structural corrosion reducing rigidity and subframe mounting point corrosion. These won't show up on a standard MOT but can be expensive to fix — repairs start from £2,000. A specialist pre-purchase inspection is worth the investment on this model.
Always check the car's full MOT history for patterns — recurring advisories often become failures within 12 months. And verify the service history to confirm maintenance has been kept up to schedule. Enter any reg into our free car check to see the complete picture.
Looking at a specific Jaguar Xj?
Enter the reg to see its full MOT history, mileage records, write-off status, and finance checks.
Jaguar Xj MOT FAQs
What are the most common MOT failures on a Jaguar Xj?
Based on 110,053 DVSA MOT tests, the most common failure is suspension ball joints worn — at 270x the national fleet average. Other frequent failures include headlight fault and transmission joint, belt or chain worn.
Is the Jaguar Xj reliable based on MOT data?
The Jaguar Xj has 20 MOT failure categories above the fleet average. Specialists also flag structural corrosion reducing rigidity as a concern. A pre-purchase inspection and service history check are recommended.
What MOT failures should I expect at high mileage?
Above 100,000 miles, the Jaguar Xj most commonly fails on suspension ball joints worn and fluid leak. Under 60,000 miles, the main issues are suspension ball joints worn and anti-roll bar links worn.
How do I check a Jaguar Xj's MOT history?
Enter the registration number into our free car check above. You'll see every MOT test result, advisories and failures, mileage readings, write-off status, and finance checks.
MOT failure data sourced from DVSA bulk test records via data.gov.uk. Ratios compare this model's failure rate against the national fleet average. Known issues sourced from manufacturer bulletins, specialist workshops, and verified owner reports.