Audi TT 1999: MOT failure rate for its age

44.3% of 2,032 MOT tests of the Audi TT 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 99.2 (95% CI 92.7–105.6; 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.

Audi TT built in 1999 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	44.3	%	all ages tested	2019–2024	2032
Index against this model at the same age (95% CI 92.7–105.6)	99.2	index	100 = normal for this model at that age	2019–2024	2032
Rank among this model's 22 build years	10	of 22	1 = fails least for its age	2019–2024	2032
Tested in 2024	156	tests	median 122,443 miles	2024	156

Built 1999 against Audi TT normal for the age: first-time MOT failure share at each age, age 20: 44.1% vs 47%; age 21: 42.8% vs 43.8%; age 22: 46.4% vs 42.2%. Axis from 0% to 50%. DVSA MOT bulk data, 2019–2024.

Check a 1999 Audi TT by registration · All Audi TT 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 Audi TT 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.

Audi TT 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	864	44.1	40.8–47.4	47	93.8
21	614	42.8	39–46.8	43.8	97.8
22	554	46.4	42.3–50.6	42.2	110

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 2,032 (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 Audi TT?

The most common failure group on cars built in 1999 is lamps, reflectors and electrical equipment: 49.3 items per 100 first tests, against 15.9 across all build years of the Audi TT. These counts are not age-adjusted: cars built in 1999 were tested at ages 20 to 22.

Failure items per 100 first tests, Audi TT built 1999 against the Audi TT in all build years (2019–2024, not age-adjusted)
Failure group	Built 1999, per 100	All build years, per 100	Items
Lamps, reflectors and electrical equipment	49.3	15.9	1,541
Suspension	29.7	12.5	929
Brakes	29.5	9.6	921
Body, chassis, structure	20.7	7.9	646
Visibility	12.6	6.4	393

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 3,126 (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 22 published build years of the Audi TT, 1999 ranks 10 (1 = fails least for its age). 2000: index 101.6.

Audi TT build years: index against the model at the same age (2019–2024)
Build year	Index (100 = normal)	95% interval	Verdict	Tests
1999	99.2	92.7–105.6	no different (rough estimate)	2,032
2000	101.6	98.8–104.4	no different	11,369
2001	103.5	101.4–105.5	worse	21,209
2002	105.2	103.5–106.9	worse	32,957
2003	102.9	101.2–104.5	worse	35,630
2004	102.5	100.8–104.2	worse	33,409
2005	105.9	103.8–107.9	worse	24,875
2006	106.1	103.7–108.5	worse	19,594
2007	97.0	95.5–98.5	better	50,548
2008	98.6	96.9–100.3	no different	45,179
2009	100.1	98.1–102.0	no different	37,413
2010	100.9	98.9–103.0	no different	39,522
2011	94.2	92.1–96.3	better	39,174
2012	88.9	86.5–91.2	better	34,042
2013	91.9	89.4–94.3	better	38,273
2014	99.9	96.5–103.4	no different	23,948
2015	100.6	98.1–103.2	no different	52,216
2016	98.4	95.9–101.0	no different	56,257
2017	92.5	89.5–95.6	better	39,461
2018	97.2	92.3–102.1	no different	16,957
2019	95.4	89.9–100.9	no different	14,061
2020	106.9	98.1–115.8	no different	6,211

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 674,337 (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). Audi TT 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/audi-tt/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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