Porsche Cayman 2015: MOT failure rate for its age

5.7% of 6,653 MOT tests of the Porsche Cayman first registered in 2015 failed at the first attempt (2019–2024; retests excluded). Against this model's own normal rate at the same ages the index is 89.6 (95% CI 80.5–98.6; 100 = normal for this model at that age): the 2015 Porsche Cayman fails less often than other build years of the same model at the same age.

Porsche Cayman built in 2015 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	5.7	%	all ages tested	2019–2024	6653
Index against this model at the same age (95% CI 80.5–98.6)	89.6	index	100 = normal for this model at that age	2019–2024	6653
Rank among this model's 16 build years	6	of 16	1 = fails least for its age	2019–2024	6653
Tested in 2024	1077	tests	median 33,673 miles	2024	1077

Built 2015 against Porsche Cayman normal for the age: first-time MOT failure share at each age, age 4: 5.2% vs 5.4%; age 5: 6.3% vs 6.7%; age 6: 5.4% vs 5.9%; age 7: 4.9% vs 6%; age 8: 5.6% vs 6.6%; age 9: 6.9% vs 7.8%. Axis from 0% to 10%. DVSA MOT bulk data, 2019–2024.

Check a 2015 Porsche Cayman by registration · All Porsche Cayman 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 2015 Porsche Cayman fail at each age?

Cars built in 2015 were tested at ages 4 to 9 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 Cayman built 2015: 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)
4	1,143	5.2	4.1–6.7	5.4	97.9
5	1,082	6.3	5–7.9	6.7	94.4
6	1,120	5.4	4.2–6.8	5.9	91.1
7	1,106	4.9	3.8–6.3	6	82
8	1,125	5.6	4.4–7.1	6.6	85.3
9	1,077	6.9	5.5–8.5	7.8	87.8

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 6,653 (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 2015 Porsche Cayman?

The most common failure group on cars built in 2015 is tyres: 3 items per 100 first tests, against 4.2 across all build years of the Porsche Cayman. These counts are not age-adjusted: cars built in 2015 were tested at ages 4 to 9.

Failure items per 100 first tests, Porsche Cayman built 2015 against the Porsche Cayman in all build years (2019–2024, not age-adjusted)
Failure group	Built 2015, per 100	All build years, per 100	Items
Tyres	3	4.2	202
Visibility	3	3.4	199
Brakes	1.3	4.2	84
Lamps, reflectors and electrical equipment	0.9	5.2	62
Suspension	0.7	2.6	47

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 6,653 (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 2015 compare with the years around it?

Among the 16 published build years of the Porsche Cayman, 2015 ranks 6 (1 = fails least for its age). 2014: index 100.4. 2016: index 94.6.

Porsche Cayman build years: index against the model at the same age (2019–2024)
Build year	Index (100 = normal)	95% interval	Verdict	Tests
2005	108.7	93.4–124.0	no different (rough estimate)	871
2006	110.0	105.2–114.8	worse	9,285
2007	107.3	102.3–112.3	worse	8,726
2008	108.6	101.9–115.2	worse	5,458
2009	78.5	71.5–85.5	better	4,062
2010	89.2	80.4–98.1	better (rough estimate)	3,280
2011	83.5	74.4–92.6	better (rough estimate)	3,333
2012	87.0	74.1–99.9	better (rough estimate)	2,067
2013	90.6	82.4–98.9	better	6,321
2014	100.4	91.9–109.0	no different	7,255
2015	89.6	80.5–98.6	better	6,653
2016	94.6	84.7–104.6	no different	6,109
2017	95.8	84.4–107.2	no different	4,923
2018	115.2	102.8–127.6	worse	5,092
2019	102.3	87.3–117.3	no different (rough estimate)	3,136
2020	85.2	59.1–111.2	no different (rough estimate)	925

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 77,496 (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 Cayman 2015 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-cayman/2015/

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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