Porsche Boxster 2005: MOT failure rate for its age

19.7% of 20,191 MOT tests of the Porsche Boxster first registered in 2005 failed at the first attempt (2019–2024; retests excluded). Against this model's own normal rate at the same ages the index is 90.8 (95% CI 87.9–93.6; 100 = normal for this model at that age): the 2005 Porsche Boxster fails less often than other build years of the same model at the same age.

Porsche Boxster built in 2005 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	19.7	%	all ages tested	2019–2024	20191
Index against this model at the same age (95% CI 87.9–93.6)	90.8	index	100 = normal for this model at that age	2019–2024	20191
Rank among this model's 23 build years	3	of 23	1 = fails least for its age	2019–2024	20191
Tested in 2024	3219	tests	median 74,797 miles	2024	3219

Built 2005 against Porsche Boxster normal for the age: first-time MOT failure share at each age, age 14: 19.4% vs 18.5%; age 15: 18.5% vs 18.6%; age 16: 20.3% vs 21.7%; age 17: 20% vs 22.6%; age 18: 20.1% vs 24.6%; age 19: 20.1% vs 24.6%. Axis from 0% to 30%. DVSA MOT bulk data, 2019–2024.

Check a 2005 Porsche Boxster by registration · All Porsche Boxster 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 2005 Porsche Boxster fail at each age?

Cars built in 2005 were tested at ages 14 to 19 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.

Porsche Boxster built 2005: 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)
14	3,607	19.4	18.1–20.7	18.5	104.6
15	3,224	18.5	17.2–19.8	18.6	99.5
16	3,405	20.3	18.9–21.6	21.7	93.6
17	3,400	20	18.7–21.4	22.6	88.5
18	3,336	20.1	18.8–21.5	24.6	81.7
19	3,219	20.1	18.7–21.5	24.6	81.4

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 20,191 (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 2005 Porsche Boxster?

The most common failure group on cars built in 2005 is brakes: 10.3 items per 100 first tests, against 8.3 across all build years of the Porsche Boxster. These counts are not age-adjusted: cars built in 2005 were tested at ages 14 to 19.

Failure items per 100 first tests, Porsche Boxster built 2005 against the Porsche Boxster in all build years (2019–2024, not age-adjusted)
Failure group	Built 2005, per 100	All build years, per 100	Items
Brakes	10.3	8.3	2,074
Lamps, reflectors and electrical equipment	10.1	12.7	2,041
Suspension	8.2	6.7	1,647
Visibility	4.7	5.1	951
Noise, emissions and leaks	4.6	5.1	926

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 20,191 (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 2005 compare with the years around it?

Among the 23 published build years of the Porsche Boxster, 2005 ranks 3 (1 = fails least for its age). 2004: index 107.6. 2006: index 96.0.

Porsche Boxster build years: index against the model at the same age (2019–2024)
Build year	Index (100 = normal)	95% interval	Verdict	Tests
1998	104.3	95.7–113.0	no different (rough estimate)	1,820
1999	105.1	98.9–111.4	no different (rough estimate)	3,613
2000	100.7	96.6–104.9	no different	8,204
2001	104.1	100.5–107.7	worse	11,433
2002	108.6	105.2–112.0	worse	13,858
2003	108.4	105.1–111.7	worse	15,506
2004	107.6	103.9–111.3	worse	12,889
2005	90.8	87.9–93.6	better	20,191
2006	96.0	92.0–100.0	no different	11,632
2007	93.3	88.7–97.8	better	9,837
2008	92.9	87.0–98.8	better	6,647
2009	77.2	70.7–83.7	better	5,127
2010	81.4	74.0–88.7	better	4,854
2011	94.8	86.2–103.5	no different	4,648
2012	98.7	90.8–106.5	no different	6,588
2013	97.1	89.5–104.7	no different	7,683
2014	94.9	86.7–103.1	no different	7,230
2015	91.2	82.4–100.1	no different	6,449
2016	98.7	89.8–107.6	no different	7,470
2017	91.4	81.0–101.7	no different	5,426
2018	107.6	94.5–120.6	no different	4,208
2019	94.9	79.6–110.3	no different (rough estimate)	2,755
2020	109.2	79.8–138.6	no different (rough estimate)	873

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 178,941 (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). Porsche Boxster 2005 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/porsche-boxster/2005/

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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