2009 Mercedes-Benz Clk MOT pass rate: 65.2% (8,628 tests)

2009-registered Mercedes-Benz Clks passed 65.2% of 8,628 MOT tests in 2023–2025 — 1.2 points worse than same-age cars (66.4%). This is one of the lower-scoring Clk years after correcting for vehicle age — inspect the individual car carefully.

65.2%Pass rate, 2009 cars

98.8Age-adjusted index (100 = average)

8,628Tests analysed

93,910 miMedian mileage at test

66.9% / 61.2%Petrol vs diesel pass rate

Is the 2009 Clk getting worse?

Pass rate of 2009-registered cars across recent test years:

Test year	Pass rate
2023	64.6% -2.2 vs same-age
2024	65.9% -0.3 vs same-age
2025	65.2% -0.9 vs same-age

The raw rate normally falls as cars age. The “vs same-age” figure compares this cohort with all UK cars registered in the same year, so normal ageing is not mistaken for a bad model year.

What fails on a 2009 Clk

#	System	Defects recorded	Share
1	Suspension	3,248	37.7%
2	Brakes	1,610	18.7%
3	Tyres	1,081	12.5%
4	Lamps, reflectors and electrical equipment	1,035	12.0%
5	Visibility	496	5.8%
6	Noise, emissions and leaks	388	4.5%

All Clk years compared

Registration year	Tests	Pass rate	Vs same-age	Median mileage
2001	3,999	74.7%	+8.1 pts	99,251
2002	4,823	71.7%	+6.1 pts	104,282
2003	8,746	69.5%	+4.5 pts	103,162
2004	11,737	66.8%	+2.5 pts	102,146
2005	11,731	67.3%	+2.8 pts	104,069
2006	9,603	66.8%	+2.4 pts	103,168
2007	11,034	66.0%	+0.9 pts	102,520
2008	7,785	66.2%	+1.1 pts	100,330
2009 (this page)	8,628	65.2%	-1.2 pts	93,910

Weighing up which year to buy? See the full ranking: Mercedes-Benz Clk years to avoid.

Buying a 2009 Clk? Two checks first

Free MOT history checkThe exact car’s failures, advisories and mileage trail — sellers can’t edit it
Topdon OBD2 scannersTopdon diagnostic scanners with full-system readouts
XTOOL diagnostic toolsXTOOL code readers for petrol and diesel cars
Autel UK testersAutel professional-grade diagnostic testers

FAQs

Is a 2009 Mercedes-Benz Clk reliable?

2009-registered examples passed 65.2% of their MOT tests (8,628 tests, 2023–2025), -1.2 points versus all UK cars registered in the same year. At roughly 17 years old with a median 93,910 miles, condition now varies car by car — always check the individual MOT history.

What mileage is too high for a 2009 Clk?

The median tested example shows 93,910 miles. Anything far beyond that isn't automatically bad — a motorway-mile car with consistent service records often beats a low-mileage school-run car — but price accordingly and scrutinise the mileage trail for gaps or drops.

Should I buy the petrol or diesel 2009 Clk?

In this cohort petrols pass 66.9% of tests against 61.2% for diesels. Mileage and use can explain part of that gap, so treat it as a reason to inspect DPF and emissions history, not a fuel-type verdict.

Source: DVSA Anonymised MOT tests and results, 2023–2025 extracts (96 million Class 4 initial tests; retests excluded). Only vehicles old enough for a routine first MOT are included. Age-adjusted figures compare the model-year cohort with all vehicles of the same registration year tested in the same calendar year. Contains public sector information licensed under OGL v3.0.