Mercedes-Benz CLS 2009: MOT failure rate for its age

34.9% of 6,672 MOT tests of the Mercedes-Benz CLS first registered in 2009 failed at the first attempt (2019–2024; retests excluded). Against this model's own normal rate at the same ages the index is 111.6 (95% CI 107.0–116.1; 100 = normal for this model at that age): the 2009 Mercedes-Benz CLS fails more often than other build years of the same model at the same age.

Mercedes-Benz CLS built in 2009 at a glance
Measure	Value	Unit	Compared with	Years	Tests
Failed first time	34.9	%	all ages tested	2019–2024	6672
Index against this model at the same age (95% CI 107.0–116.1)	111.6	index	100 = normal for this model at that age	2019–2024	6672
Rank among this model's 16 build years	15	of 16	1 = fails least for its age	2019–2024	6672
Tested in 2024	1108	tests	median 112,123 miles	2024	1108

Built 2009 against Mercedes-Benz CLS normal for the age: first-time MOT failure share at each age, age 10: 32.9% vs 27.5%; age 11: 33.4% vs 28.8%; age 12: 34.7% vs 31.3%; age 13: 35.7% vs 32.5%; age 14: 35.2% vs 33.9%; age 15: 36.7% vs 31.8%. Axis from 0% to 40%. DVSA MOT bulk data, 2019–2024.

Check a 2009 Mercedes-Benz CLS by registration · All Mercedes-Benz CLS 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 2009 Mercedes-Benz CLS fail at each age?

Cars built in 2009 were tested at ages 10 to 15 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 CLS built 2009: 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)
10	869	32.9	29.9–36.1	27.5	119.5
11	791	33.4	30.2–36.7	28.8	116.1
12	1,370	34.7	32.2–37.2	31.3	110.9
13	1,319	35.7	33.2–38.3	32.5	109.7
14	1,215	35.2	32.6–38	33.9	103.9
15	1,108	36.7	33.9–39.6	31.8	115.4

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 6,672 (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 2009 Mercedes-Benz CLS?

The most common failure group on cars built in 2009 is suspension: 21.2 items per 100 first tests, against 12.7 across all build years of the Mercedes-Benz CLS. These counts are not age-adjusted: cars built in 2009 were tested at ages 10 to 15.

Failure items per 100 first tests, Mercedes-Benz CLS built 2009 against the Mercedes-Benz CLS in all build years (2019–2024, not age-adjusted)
Failure group	Built 2009, per 100	All build years, per 100	Items
Suspension	21.2	12.7	1,417
Brakes	16.9	10.6	1,127
Tyres	14.6	14.2	977
Lamps, reflectors and electrical equipment	14.5	6.9	966
Visibility	9.4	4.9	630

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 6,672 (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 2009 compare with the years around it?

Among the 16 published build years of the Mercedes-Benz CLS, 2009 ranks 15 (1 = fails least for its age). 2008: index 106.5. 2010: index 109.2.

Mercedes-Benz CLS build years: index against the model at the same age (2019–2024)
Build year	Index (100 = normal)	95% interval	Verdict	Tests
2005	91.6	87.4–95.7	better	6,373
2006	100.1	96.8–103.4	no different	10,469
2007	103.4	100.3–106.6	worse	12,036
2008	106.5	102.7–110.2	worse	9,097
2009	111.6	107.0–116.1	worse	6,672
2010	109.2	103.9–114.5	worse	4,751
2011	85.5	80.8–90.2	better	5,120
2012	96.0	91.2–100.8	no different	6,303
2013	105.0	101.9–108.0	worse	19,319
2014	102.8	98.7–106.9	no different	11,141
2015	97.4	94.1–100.6	no different	17,798
2016	94.1	90.1–98.0	better	12,884
2017	92.9	87.8–98.0	better	8,102
2018	94.8	87.4–102.3	no different	4,088
2019	107.0	98.1–116.0	no different (rough estimate)	3,376
2020	153.9	127.0–180.7	worse (rough estimate)	572

Source: DVSA MOT bulk data · Window: 2019–2024 · n = 138,101 (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 CLS 2009 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-cls/2009/

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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