At a Glance
The Jaguar Xj XJ40 has 1 identified problem that occur more often than the UK average, with Brake master cylinder or servo mounting fault being the most reported. Suspension is the most common MOT failure category. Based on 78K MOT tests from DVSA data.
Problems are patterns in the DVSA data that occur significantly more often on this model than the UK average — confirmed at 99% statistical confidence. Read how we calculate MOT pass rates and problems →
Below: the full MOT-data picture for the Jaguar Xj XJ40 — MOT pass rate vs the UK average, common problems vs UK fleet patterns, the most likely MOT failures by frequency, fault occurrence by mileage band, and pass/fail trends. All numbers drawn from DVSA records.
Jaguar Xj XJ40 MOT Pass Rate
Across 78K MOT tests from DVSA data, the Jaguar Xj XJ40 (1986–1994) has a fail rate of 39.0%.
All-time UK average fail rate: 34.9%
Common Jaguar Xj XJ40 Problems
Owner-submitted reports plus patterns we've identified across 559 million UK MOT tests. Each MOT-derived item below — whether tagged as a Problem, Wear & Tear or Consumable — shows up noticeably more often on this generation than across the UK fleet, which is why it's here. Owner reports are pinned to the top by default; use the sort and filter pills below to view a specific tier or change the order.
Brake master cylinder or servo mounting fault
503
occurrences
Tell Us About Your Problem
Help other Jaguar Xj XJ40 owners — report a problem and we'll add it to the database
Tell Us About Your Problem
Help other Jaguar Xj XJ40 owners — report a problem and we'll add it to the database
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Problems by mileage
Common problems, MOT failures and advisories on the Jaguar Xj XJ40, grouped by the mileage they typically appear at.
672 distinct problems · 166,777 total occurrences in current filter
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Advisory items are MOT tester observations. Frequency can be influenced by driving style and usage patterns.
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Other Jaguar Xj Generations
Frequently Asked Questions
What are the most common Jaguar Xj XJ40 problems?
Based on DVSA MOT data for the Jaguar Xj XJ40 (1986–1994), we have identified 1 common problem. The most frequently reported is "Brake master cylinder or servo mounting fault". Suspension is the most common MOT failure category.
How reliable is the Jaguar Xj XJ40?
This generation has 78K MOT tests on record with a 39.0% fail rate. A fault is flagged as a "Common Problem" only when it occurs significantly more often on this model than the UK average, confirmed at 99% statistical confidence.
What commonly fails the MOT on a Jaguar Xj XJ40?
There are 168 distinct MOT failure types recorded for the XJ40 (1986–1994), grouped by the mileage these failures typically occur. See the Common MOT Failures section on this page.
Can I report a problem with my Jaguar Xj XJ40?
Yes — use the "Tell Us About Your Problem" form on this page. Your report helps other Jaguar Xj owners spot problems early. All submissions are reviewed before being added to the public database.
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