Mercedes-Benz Viano 2005: MOT failure rate for its age

40.5% of 1,942 MOT tests of the Mercedes-Benz Viano 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 102.5 (95% CI 95.3–109.6; 100 = normal for this model at that age): the 2005 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.

Mercedes-Benz Viano built in 2005 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	40.5	%	all ages tested	2019–2024	1942
Index against this model at the same age (95% CI 95.3–109.6)	102.5	index	100 = normal for this model at that age	2019–2024	1942
Rank among this model's 12 build years	6	of 12	1 = fails least for its age	2019–2024	1942
Tested in 2024	344	tests	median 149,492 miles	2024	344

Built 2005 against Mercedes-Benz Viano normal for the age: first-time MOT failure share at each age, age 14: 41.2% vs 40.2%; age 15: 38.5% vs 37.3%; age 16: 39% vs 38.7%; age 17: 40% vs 38.8%; age 18: 43.4% vs 42.2%; age 19: 43% vs n/a%. Axis from 0% to 50%. DVSA MOT bulk data, 2019–2024.

Check a 2005 Mercedes-Benz Viano by registration · All Mercedes-Benz Viano 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 Mercedes-Benz Viano 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.

Mercedes-Benz Viano 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	342 (rough estimate)	41.2	36.1–46.5	40.2	102.4
15	314 (rough estimate)	38.5	33.3–44	37.3	103.2
16	382 (rough estimate)	39	34.2–44	38.7	100.8
17	473 (rough estimate)	40	35.6–44.4	38.8	102.9
18	431 (rough estimate)	43.4	38.8–48.1	42.2	102.9
19	344 (rough estimate)	43	37.9–48.3	not available	not available

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 2,286 (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 Mercedes-Benz Viano?

The most common failure group on cars built in 2005 is lamps, reflectors and electrical equipment: 45.1 items per 100 first tests, against 29 across all build years of the Mercedes-Benz Viano. These counts are not age-adjusted: cars built in 2005 were tested at ages 14 to 19.

Failure items per 100 first tests, Mercedes-Benz Viano built 2005 against the Mercedes-Benz Viano in all build years (2019–2024, not age-adjusted)
Failure group	Built 2005, per 100	All build years, per 100	Items
Lamps, reflectors and electrical equipment	45.1	29	1,030
Brakes	27.6	19.9	631
Suspension	26.3	15	602
Visibility	15.8	11.2	361
Body, chassis, structure	13.5	6.1	308

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 2,286 (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 12 published build years of the Mercedes-Benz Viano, 2005 ranks 6 (1 = fails least for its age). 2004: index 105.2. 2006: index 103.0.

Mercedes-Benz Viano build years: index against the model at the same age (2019–2024)
Build year	Index (100 = normal)	95% interval	Verdict	Tests
2004	105.2	95.8–114.6	no different (rough estimate)	1,137
2005	102.5	95.3–109.6	no different (rough estimate)	1,942
2006	103.0	96.3–109.7	no different (rough estimate)	2,273
2007	101.5	95.3–107.7	no different (rough estimate)	2,678
2008	105.5	99.3–111.7	no different (rough estimate)	2,914
2009	103.2	96.6–109.8	no different (rough estimate)	2,629
2010	100.2	93.6–106.8	no different (rough estimate)	2,595
2011	105.8	99.2–112.4	no different (rough estimate)	2,848
2012	97.6	91.8–103.4	no different (rough estimate)	3,523
2013	99.0	93.4–104.7	no different (rough estimate)	3,991
2014	98.0	92.2–103.8	no different	4,000
2015	112.2	97.3–127.1	no different (rough estimate)	723

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 31,253 (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). Mercedes-Benz Viano 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/mercedes-viano/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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