Jaguar XJ 1999: MOT failure rate for its age

34.4% of 2,518 MOT tests of the Jaguar XJ first registered in 1999 failed at the first attempt (2019–2024; retests excluded). Against this model's own normal rate at the same ages the index is 105.5 (95% CI 98.5–112.6; 100 = normal for this model at that age): the 1999 build year is no different from other years of the same model at the same age. This is a rough estimate from a smaller sample.

Jaguar XJ built in 1999 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	34.4	%	all ages tested	2019–2024	2518
Index against this model at the same age (95% CI 98.5–112.6)	105.5	index	100 = normal for this model at that age	2019–2024	2518
Rank among this model's 23 build years	20	of 23	1 = fails least for its age	2019–2024	2518
Tested in 2024	96	tests	median 83,741 miles	2024	96

Built 1999 against Jaguar XJ normal for the age: first-time MOT failure share at each age, age 20: 34.5% vs 34.1%; age 21: 34.2% vs 32.2%; age 22: 34.4% vs 30.9%. Axis from 0% to 40%. DVSA MOT bulk data, 2019–2024.

Check a 1999 Jaguar XJ by registration · All Jaguar XJ MOT statistics · Download the build-year table (CSV)

Data release dvsa-2024-v2 (24 Sep 2026) · page updated 30 Sep 2026 · full dataset (v5).

How does the 1999 Jaguar XJ fail at each age?

Cars built in 1999 were tested at ages 20 to 22 between 2019 and 2024. Each row compares their first-time failure share with what this model normally shows at that age, after allowing for the overall failure level of each test year.

Jaguar XJ built 1999: first-time MOT failure by age, against the model's normal rate at that age (2019–2024)
Age	Tests	Failed, %	95% interval	Normal for this model at that age, %	Index (100 = normal)
20	1,000	34.5	31.6–37.5	34.1	101.2
21	809	34.2	31.1–37.6	32.2	106.4
22	709	34.4	31–38	30.9	111.3

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 2,518 (initial tests) · Method: normal rate = this model's first-time failure share at that age across its build years (cells of 400+ tests), adjusted for each test year's overall level; cells of 30+ tests, under 500 marked rough · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

What fails most on the 1999 Jaguar XJ?

The most common failure group on cars built in 1999 is suspension: 30 items per 100 first tests, against 23 across all build years of the Jaguar XJ. These counts are not age-adjusted: cars built in 1999 were tested at ages 20 to 22.

Failure items per 100 first tests, Jaguar XJ built 1999 against the Jaguar XJ in all build years (2019–2024, not age-adjusted)
Failure group	Built 1999, per 100	All build years, per 100	Items
Suspension	30	23	1,145
Noise, emissions and leaks	22.8	5	868
Body, chassis, structure	16.9	4.7	644
Lamps, reflectors and electrical equipment	15.1	12.5	577
Brakes	13.9	11.3	531

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 3,812 (initial tests of this build year) · Method: failure items grouped by DVSA's top-level defect groups, per 100 initial tests; groups with 30+ items · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

How does 1999 compare with the years around it?

Among the 23 published build years of the Jaguar XJ, 1999 ranks 20 (1 = fails least for its age). 1998: index 98.2. 2000: index 106.7.

Jaguar XJ build years: index against the model at the same age (2019–2024)
Build year	Index (100 = normal)	95% interval	Verdict	Tests
1998	98.2	92.1–104.3	no different (rough estimate)	3,071
1999	105.5	98.5–112.6	no different (rough estimate)	2,518
2000	106.7	100.8–112.7	worse (rough estimate)	3,620
2001	98.4	93.4–103.4	no different	4,819
2002	99.9	94.8–105.1	no different	4,620
2003	97.1	94.0–100.1	no different	12,987
2004	101.3	98.0–104.6	no different	11,809
2005	98.4	94.3–102.5	no different	7,855
2006	104.5	100.6–108.4	worse	9,425
2007	102.8	98.7–106.8	no different	8,735
2008	96.9	92.1–101.7	no different	6,154
2009	100.9	94.3–107.5	no different (rough estimate)	3,627
2010	94.3	90.0–98.6	better	8,616
2011	97.1	92.8–101.4	no different	9,539
2012	97.3	91.8–102.7	no different	6,401
2013	110.5	104.8–116.2	worse	7,086
2014	109.4	103.1–115.6	worse	6,475
2015	99.1	92.6–105.6	no different	5,989
2016	95.0	88.7–101.3	no different	6,879
2017	81.5	74.3–88.7	better	4,920
2018	86.0	76.3–95.7	better (rough estimate)	3,089
2019	89.7	73.6–105.8	no different (rough estimate)	1,275
2020	77.2	45.6–108.7	no different (rough estimate)	322

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 139,831 (initial tests) · Method: observed failures against those expected for the same model at the same ages, test-year level adjusted; verdict follows the printed one-decimal bound · Updated: 30 Sep 2026 · Release: dvsa-2024-v2 · CSV

How to cite this page

MOT Risk Index (2026). Jaguar XJ 1999 MOT statistics (data release dvsa-2024-v2; full dataset motriskindex-families-2024-v5, DOI 10.5281/zenodo.22975051), updated 30 September 2026. motriskindex.co.uk/cars/jaguar-xj/1999/

How every figure is calculated: methodology. Age, test year and build year are tied together (age = test year − build year), so the test-year level is taken as observed, not estimated.

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