Mercedes-Benz CLK — MOT statistics 2024

The Mercedes-Benz CLK failed 37.79% of 28,446 first MOT attempts in 2024 ("first-time", excluding retests). Adjusted for the age of the fleet, its initial-failure ratio is 90.0 (100 = expected for its age profile). This car fails its MOT about 10% less often than expected for its age.

Age-adjusted peer: Ford Kuga (index 90.2) — the two published results are 0.2 index points apart.

Mercedes-Benz CLK common problems: what actually fails the MOT

Lamps, reflectors and electrical equipment are well below the reference at 30.1 per 100 tests, against 37.9 per 100 tests across UK vehicles of the same ages.

higher bar = fails more oftenrate per 100 tests

family vs national — matched to UK vehicles of the same ages — top component groups, per 100 tests. Legend: This family · National avg. Combined labels: family / national average. A gap here reflects how these vehicles are driven, used and maintained as well as how they were built — an MOT defect is a test outcome, not a breakdown.

Named defects ranked by how much more often they appear than the national average — not by raw rate.

Mercedes-Benz CLK MOT advisories: what gets flagged

Brakes are highest at 67.9 per 100 tests; Emissions & leaks are lowest at 8.5 per 100 tests — the gap is 59.4 per 100 tests.

higher bar = flagged more oftenadvisory items per 100 initial tests

Advisories are wear the tester noted but didn't fail — what will need money soon.

If a car like this fails, does it fail again?

A failure rate does not say whether a failure is a one-off or the start of something. This follows the same vehicles into their next ordinary MOT a year later — retests after a repair are excluded, because they follow a failure by definition. 2019-2024.

A failed test raises next year's chance of failing again by 3.6 percentage points. The failure most likely to come back is visibility — 35.5% of those vehicles fail again next year. Some of this is the vehicle and some is the owner: a car that was let go once tends to be let go again. One caveat: a car that fails may be sold or scrapped rather than tested again, so these figures describe the vehicles that came back.

Adjusted for how much these are actually driven

The headline index adjusts for the fleet's age. Wear, though, follows mileage: a three-year-old taxi and a three-year-old garage queen sit in the same age band. These two rows compare every car with vehicles of the same age, and then with vehicles of the same age and the same annual mileage, 2019-2024, on 173,632 tests. Both stand on the six-year corpus so they are measured on identical data — compare them with each other, not with the headline index above, which is measured on 2024 alone.

Mileage changes little here (-0.2 points): this fleet is driven about as much as the vehicles it is compared with. One limit to keep in mind: mileage is partly a result of how often a car breaks down — one that spends weeks in the workshop covers fewer miles — so the mileage-matched figure can understate a real weakness. Tests with no usable odometer reading are left out of it.

How the Mercedes-Benz CLK compares with cars of its own age and size

Not against the whole fleet — against cars of the same size class tested at the same age, 2019-2024.

Raw first-time failure rates within each age, so fleet age cannot flatter either side. A positive difference means this model fails more often than its own class at that age.

How does the Mercedes-Benz CLK perform as it gets older?

The CLK at age 20 is well below the reference at 35.5%, against 41.0% for all vehicles of the same age.

higher = larger sharecompare shares in percentage points

Chart axes: car age, years · failure-rate scale 0–47%.

Takeaway: solid line: this family; dashed: all cars.

Mercedes-Benz CLK petrol vs diesel: which ages best

Diesel is highest at 43.9%; Petrol is lowest at 36.3% — the gap is 7.5 percentage points.

higher = larger sharecompare shares in percentage points

Chart sample sizes: n=23k · n=5,514.

How dangerous are Mercedes-Benz CLK MOT failures?

Major defects stand out at 87.0 per 100 tests, against 52.8 per 100 tests nationally.

higher bar = fails more oftenrate per 100 tests

Chart values: Minor 23.0 · Major 87.0 · Dangerous 14.2.

Per 100 tests on this family. National average: Minor 14.2 · Major 52.8 · Dangerous 11.2 per 100.

Does the month of a Mercedes-Benz CLK MOT matter?

Jan is highest at 40.2%; Aug is lowest at 37.4% — the gap is 2.9 percentage points.

higher = larger sharecompare shares in percentage points

Chart scale: 27%–42%.

bars: Mercedes-Benz CLK · dashed: all class-4 cars

Takeaway: the spread between best and worst month is 2.9 percentage points — booking month barely matters for this family. Seasonality partly reflects registration-date clustering, not weather.

Before reading the shape: most of it is not about cars. Britain changes its registration plates twice a year, and 18.9% of these cars were first registered in March with another17.1% in September — 36% in two months against the 17% an even spread would give. An MOT falls due three years after first registration, so the buying calendar becomes the testing calendar. That shapes how many cars are tested each month — not how often they fail: the busiest months here are not the worst ones, so read the failure line on its own and the volume behind it separately.

Mercedes-Benz CLK average mileage by age

At age 18, the middle half of CLKs runs from 77,661 miles to 131,418 miles, against 104,141 miles as the median.

further right = more milesmedian is the typical car; band is p25–p75

Chart axes: car age, years · odometer scale 0–138k mi.

Does high mileage mean more Mercedes-Benz CLK MOT failures at the same age?

Within the same age group, split by odometer (2024 MOTs), so this separates wear from age: at ages 15+, 16.9% of those with under 40,000 miles failed first time versus 43.5% of those with over 140,000 miles.Inside this age group, higher mileage goes with more failures.

line: median · band: middle half of the fleet (p25–p75)

A typical 18-year-old CLK has ~104,141 miles on the clock. Much more — ask why; much less — check for gaps in the MOT history.

Where in Britain the Mercedes-Benz CLK fails its MOT most

Aberdeen area is highest at 54.3%; Croydon area is lowest at 28.1% — the gap is 26.2 percentage points.

higher = larger sharecompare shares in percentage points

Toughest areas	% failing	vs model overall
Aberdeen (AB)	54.3%	+15.9 pp
Kirkcaldy (KY)	52.42%	+14.0 pp
Falkirk (FK)	51.11%	+12.7 pp
Perth (PH)	50.93%	+12.5 pp
Dundee (DD)	50%	+11.6 pp

Easiest areas	% failing	vs model overall
Croydon (CR)	28.12%	-10.3 pp
Enfield (EN)	28.6%	-9.8 pp
Uxbridge (UB)	28.63%	-9.8 pp
Twickenham (TW)	28.68%	-9.8 pp
London SE (SE)	29.56%	-8.9 pp

Why do areas differ?

For each external factor we correlate the area fail rate with the factor across postcode areas that have ≥800 tests of this family, then compare the bottom vs top fifth (quintile) of the factor. Correlation, not causation — factors travel together (the north is colder and often poorer; urban areas are denser and less salted). Road surface condition is joined now, for the 91 English areas the DfT publishes, and it explains nothing: the correlation with suspension failures is −0.01 and with body and structure failures 0.07. Potholes wreck wheels and tyres between tests, but by the time a car reaches the bay the road it drives on leaves no measurable trace.

In areas with the highest mot centre density this model fails 10.0 pp more often than in the lowest fifth (r=0.72, n=87 areas with ≥800 tests).

In areas with the highest urban share this model fails 10.8 pp less often than in the lowest fifth (r=-0.62, n=87 areas with ≥800 tests).

In areas with the highest terrain gradient this model fails 5.8 pp more often than in the lowest fifth (r=0.37, n=47 areas with ≥800 tests).

Values shown in the quintile chart

Factor	Low Q	High Q	Gap	Correlation
MOT centre density	33.0%	42.9%	+9.9 pp	r=0.72
Urban share	43.3%	32.5%	-10.8 pp	r=-0.62
Terrain gradient	38.3%	44.1%	+5.8 pp	r=0.37

Factors that only mean something combined

Some conditions are useless on their own and informative multiplied together. Frost days alone say little — Britain barely freezes. Salt tonnage alone says little — it tracks frost. Distance to the sea alone says little. Multiply the first two and divide by the third and you get an index of how hard an area attacks a car's underside, and it lines up with the corrosion defects we actually record. We built five such combinations and tested each against our own data. Three survived; two did not, and the failures are listed here on purpose — a proxy that was never checked is decoration. One survivor only survived on the second attempt: built from a crude stand-in for street parking it failed outright, and rebuilt from the census — terraced streets carrying more cars than they have driveways — it works, and carries information the salt index does not.

Composite area indicators, each tested against a defect rate we measure

Composite	Built from	Tested against	r	Verdict
Underbody corrosion	frost days × salt load ÷ (distance to coast + 1)	share of tests with a corrosion defect	+0.42	holds (116 areas)
Tyre wear	rain days × annual miles ÷ age at first tyre advisory	share of tests failing on tyres	+0.45	holds (116 areas)
Overnight corrosion	terraced housing × cars per household × frost days	share with a corrosion defect	+0.41	holds (102 areas) — and adds signal beyond the first index
Deferred maintenance	deprivation × advisory-to-failure conversion ÷ labour rate	cars repeating the same advisory	−0.26	fails (118 areas)
Powertrain stress	engine capacity ÷ kerb weight	suspension, brake and emissions failures	−0.16	fails (22 models)

The deprivation result is the one worth dwelling on. The intuition that poorer areas defer repairs is strong enough that most people treat it as established. We tested it twice — once on raw failure rates (r = 0.04) and again, more fairly, on whether an advisory turns into a failure — and it did not hold any of the three times we tried it — on raw failure rates, on advisory-to-failure conversion, and again with deprivation measured properly inside each nation rather than England alone. We are closing it. What does predict local failure rates is the density of test centres, which is a statement about testing, not about cars.

All external-factor correlations (machine-readable)

Factor	r	n areas	Low-Q fail %	High-Q fail %	Gap pp	Low-Q factor	High-Q factor
MOT centre density (per 10k vehicles)	0.720	87	33.0	42.9	+10.0	4.9	8
Urban share (0–1)	-0.624	87	43.3	32.5	-10.8	0.5	1
Terrain gradient (% grade)	0.369	47	38.3	44.1	+5.8	0.5	3.3
Road-salt proxy (g/m²-yr)	0.326	87	36.2	41.0	+4.8	212.2	508
Frost days (days/year)	0.314	87	38.3	41.1	+2.8	10.8	28.9
Distance to coast (km)	-0.265	87	41.6	38.0	-3.6	7.4	82.7
Income deprivation (score)	-0.131	81	39.0	36.6	-2.4	0.1	0.2

Deprivation uses England IMD 2019 income score only (Scotland SIMD is a different scale). Salt proxy is a simplified NWSRG-style dry-salt sum from air Tmin; coastalness is distance from the area centroid to the nearest coastline.

Every dot is a postcode area — size = how many were tested there, colour = share failing. These figures are not age-adjusted: coastal and rural areas often run older fleets and salted roads, so higher raw fail rates do not automatically mean a worse local stock of this model.

Map labels: Scotland · N. England · Wales · London · S. West. Colour scale: 30%–48% failing.

How many miles does a Mercedes-Benz CLK last?

100,000+ miles is highest at 49.6%; 200,000+ miles is lowest at 1.5% — the gap is 48.1 percentage points.

higher = larger sharecompare shares in percentage points

Of 174,526 tests of this family with a usable odometer in 2024, 49.6% had reached 100k miles, 11.4% had reached 150k miles, 1.5% had reached 200k miles. This is a cross-section of cars still presenting for MOT, not a full birth cohort.

Mercedes-Benz CLK faults that come together

Body & structure + Emissions & leaks stand out at 5.18×, against 1.00× if the faults were independent.

above 1.0× = more than expectedbelow 1.0× = less

Defects in «Body, chassis, structure» and «Noise, emissions and leaks» appear together 5.18× more often than chance (1,140 co-occurrences in the same test; lift≥1.3, n≥500).

Lift = how many times more often both groups appear on the same test than if independent. A pair is listed from 5 tests with both faults; the lift is shown from 20, and called above chance only when its 95% interval excludes 1 (see rough estimates).

Is low mileage better for a Mercedes-Benz CLK?

Cars driven under 5,000 miles a year is well below the reference at 27.8%, against 45.7% for cars driven 8,000–12,000 miles a year.

higher = larger sharecompare shares in percentage points

At matched ages 5–14, cars averaging under 5k miles/year fail at 27.8% vs 45.7% for 8–12k miles/year — 17.8 pp lower (n_low=7,546, n_normal=8,594). In this family low annual use is associated with fewer MOT fails, not more — the ‘garage queen’ penalty is not visible in overall fail rates.

Which Mercedes-Benz CLK engine is best?

diesel over 2.0 is highest at 110.6; diesel 1.8–2.0 is lowest at 88.8 — the gap is 21.8 points.

below 100 is betterabove 100 is worse100 = normal for this model at that age

Splitting this model by fuel alone hides the thing that actually differs. Within the same badge, the diesel over 2.0 runs at 110.6 against this model's own age norm while the petrol over 2.0 runs at 95.7 — a spread of 14.9 points between two cars that share a name.

Read this one with more care than the rest of the page. Age is held constant, but who buys which engine is not: the largest capacity in a range is often a performance or executive variant that is garaged, cherished and lightly driven, while the smallest is frequently a fleet or entry car worked hard from new. The gap below is real in the test records; how much of it is the engine and how much is the owner, this data cannot separate. Bands under 100 tests are not shown; bands under 5,000 tests are rough estimates.

Best year for a Mercedes-Benz CLK, and the years to avoid

Build year 2004 is highest at 103.1; Build year 2001 is lowest at 92.0 — the gap is 11.1 points.

below 100 is betterabove 100 is worse100 = normal for this model at that age

build year vs the same model at the same age · 100 = as expected

The best build year here is 2001 and the weakest is 2004. Comparing build years sounds simple and is not: within a single year of testing, a car's build year and its age are the same number, so a naive comparison of years is a comparison of ages wearing a disguise. Each year below is measured against the same model at the same age in other cohorts, across six years of testing — 2 of 13 years come out distinguishable from their own model's age norm.

Two limits worth knowing before you act on this. Age, test year and build year are locked together by arithmetic, so the test-year effect is taken from the observed national failure level of each year rather than estimated — it is an adjustment, not a solution.

Mercedes-Benz CLK MOT repair costs

The MOT-failure repair budget per test runs from £155.22 to £294.92, against £54.85 for the test itself.

bigger number = costs morepounds per test, MOT-failing faults only

Multiply how often each component fails on this model by what that repair usually costs, and you get the amount an owner should expect to budget per test for MOT-failing faults only — roughly £155 to £295, on top of the test fee itself. It is a budgeting figure, not a quote: the spread between a set of pads and a set of discs is most of the range.

Prices are modal quotes from a hand-kept catalogue of published UK garage guides — we do not scrape the booking sites, their terms forbid it, so this list is short and updated by hand with a source and date against each line. Each line prices one typical repair in that group, not a full remedy, and only groups our catalogue actually covers are counted. The contrast worth noticing is the second card: the legal maximum for the test has been £54.85 since 2010, while the repairs it uncovers have followed inflation the whole time.

For scale from a different direction: Warrantywise, which sees used-car warranty claims rather than test failures, puts the average claim at £2,052 across the ten highest-claim models it ranks and £539 for Honda, the lowest-claim make in its index (Warrantywise index 2026, 1.6 million claims, cars aged 3–15). Those sit an order of magnitude above the figures in this table, and the gap is the point: a warranty claim is a gearbox or an engine, which almost never fails an MOT, while the faults that do fail one are corrosion, lamps and tyres, which no warranty pays for. The two numbers answer different questions and neither replaces the other.

Mercedes-Benz CLK running costs for a fleet

Vehicles failing at age 19 are close to the reference at 39.0%, against 39.0% at age 15, tested in the same year.

higher = larger sharecompare shares in percentage points

No single year stands out as the point where this model starts costing more: the year-to-year steps in its failure rate are too small or rest on too few tests to name one (D1 rule: a step is named only with at least 2,000 tests on both sides and a jump above 3 percentage points).

Repair spend uses the same modal prices as the section above, so it inherits the same limits: one typical repair per component group, not a full remedy. Downtime is the gap between the failed test and the passed re-test, which is the window a vehicle is legally off the road.

Mercedes-Benz CLK rust problems: where they corrode

Age-standardised corrosion susceptibility stands out at 2.65×, against 1.00× for the national age-standardised rate.

above 1.0× = rusts more than averagebelow 1.0× = rusts less

This Mercedes-Benz CLK fails on corrosion far more often than average once age is held constant, and its owners live in areas that are gentler than most for the models we publish. Those two point in opposite directions, which is the informative case: it rusts more than average despite living in gentler places, so the cause is the car, not the postcode.

Corrosion is the one failure mode that is as much about geography as about the car. We keep the two apart on purpose: a model can look rusty simply because it is popular in Scotland, and a model can look clean simply because it is bought in Surrey. Blending them into a single score would hide which of the two is doing the work.

Exposure is this model's tests weighted by an area corrosion index built from frost days, salt load and distance to the coast — the composite validated at r = 0.42 against corrosion defects we actually record. It is published as a rank, not a raw score, because every mainstream model skews towards low-corrosion areas for the simple reason that most of Britain's cars are in the south. Susceptibility is standardised to the national age profile, so an old fleet does not get labelled a rusty model.

Does a Mercedes-Benz CLK advisory become a failure?

Lamps, reflectors and electrical equipment are highest at 27.8%; Road wheels are lowest at 1.8% — the gap is 26.0 percentage points.

higher = more likelypercentage is the observed transition probability

chance the same component fails at the next MOT, given an advisory now

This is the question an advisory note actually raises, and it needs six years of test history to answer. We followed the same vehicles from one MOT to the next across 2019–2024 and measured how often a component that was merely advised came back as a genuine failure at the next test.

Read it as a budgeting horizon, not a prophecy: the most likely component above turns into a failure for about 28 in 100 cars, and the median gap is 12 months and roughly 3,445 miles. The rest were repaired, sold, scrapped, or simply held. Rows with fewer than 500 tracked advisories are not shown.

What will fail next on a Mercedes-Benz CLK?

Suspension after a failure at age 12-14 is highest at 29.2%; Visibility after a passed at age 20+ is lowest at 5.4% — the gap is 23.8 percentage points.

higher = more likelypercentage is the observed transition probability

The same chains, cut differently: given a car's age and how its last test went, which component most often causes trouble at the following one.

The pattern that repeats across every family: a failure at one test roughly doubles the chance of a failure on the same component at the next one, and an advisory sits about half-way between a clean pass and a failure. Age bands in years; probabilities are per car, not per defect item.

Mercedes-Benz CLK ownership: what six years of MOTs show

The ten-day re-test pass rate is highest at 64.5%; The later re-test pass rate is lowest at 5.6% — the gap is 58.9 percentage points.

higher = larger sharecompare shares in percentage points

Failing is usually a same-week event, not a disaster. Of 49,030 failures followed through to their re-test, 29.91% were repaired and passed the same day and 64.52% within ten days; the median gap is 1 day. 139,679 defect items were cleared in the process.

Per mile driven, not per year. Dividing failures by the miles that actually went onto the odometers between consecutive tests gives 0.904 failures per 10,000 miles, on a median of 2,962 miles a year across 39,925 chains. This is the number to compare between models — an annual rate quietly rewards cars that barely leave the drive.

Two populations hide inside one model. 20.52% of these cars strung together three or more tests with nothing recorded at all, while 39.47% carried the same advisory three times or more — the same fault, noted, ignored, noted again. When you buy used you are buying one of those two histories, and the MOT record shows which.

Odometer anomalies: 1.524% of 40,020 chains show a reading lower than the previous test, with a median drop of 34,694 miles. We call this an anomaly and not fraud on purpose — instrument swaps, imports, unit mix-ups and keying errors all land in the same bucket. Obvious typos (drops under 100 miles or over 90% of the reading) are already excluded.

Mercedes-Benz CLK safety recalls and how to check yours

DVSA recall campaigns stand out at 5.

bigger number = more recorded casescompare like-for-like scope, not sample size alone

recall campaigns launched per year

DVSA lists 5 safety recall campaigns for the Mercedes-Benz CLK, covering roughly 41,112 vehicles in total. A recall is the manufacturer fixing a fault for free, so an open recall on your car costs nothing to clear.

Counter-intuitive, and measured on our own data: across the 25 families published here, more recalls go with a lower MOT Risk Index (r = −0.52). Heavily recalled models are not worse cars in the test bay — an active manufacturer removes the fault before it becomes an MOT failure.

Check whether a specific car has an outstanding recall — free, by registration — at DVSA's recall service. Source: DVSA vehicle safety recalls (check-vehicle-recalls.service.gov.uk), OGL.

Mercedes-Benz CLK inspection results in other countries

United Kingdom MOT stands out at 37.8%, against 26.0% nationally.

higher = larger sharecompare shares in percentage points

The verdict is consistent across every regime where the difference is clear, which is the strongest form this comparison takes: independent inspectorates, different rulebooks, same direction of travel.

Worth dwelling on how mundane the top of that list is: tyre pressure, tread depth, headlight aim. The Dutch APK records 1.602 defects per inspection against a much higher national failure rate than Britain's, and the reason is not that Dutch cars are worse — it is that the two regimes draw the line between "note it" and "fail it" in different places. Codes are the RDW's own; the English wording here is our translation of the Dutch original.

Britain is not the only country that inspects every car every year, and the Mercedes-Benz CLK is on the road in all of them. Each national regime writes its own rules, so the pass rates below are not comparable to each other — what does travel across a border is whether a model sits above or below its own country's average.

One caveat before you read the UK row: these are raw failure rates, because no other country publishes the age detail our index needs. This model's raw UK rate looks worse than the national average while its age-adjusted index is 90.0 — the fleet here is unusually old, and the raw column silently credits that. The index above is the fair comparison; this table is for reading each country against itself.

Rows with fewer than 500 inspections are not published. Sources: RDW open data — Meldingen Keuringsinstantie + Geconstateerde Gebreken + Gekentekende voertuigen (2024), CC0. Not an RDW endorsement.; Statens vegvesen — Periodisk kjøretøykontroll (PKK) 2024, CC BY 4.0; Traficom — Periodic inspections of cars by model / by model and fault object 2024, CC BY 4.0. Adapted; licences and full notice.

Mercedes-Benz CLK MOT: quick answers

Mercedes-Benz CLK MOT Risk Index is well below the reference at 90.0, against 100 for a car with the same age profile.

below 100 is betterabove 100 is worse100 = normal for this model at that age

What is the Mercedes-Benz CLK first-time MOT pass rate?

62.21% of first attempts passed in 2024 (28,446 tests). This is the first-time figure: retests after repair are excluded. Basis: first-time, excluding retests.

Why does this number differ from other sites?

Other sites often report a pass rate that includes retests or counts all attempts. Our 37.79% figure is the first-time initial failure rate, using 28,446 primary tests as the denominator (first-time, excluding retests). The age-adjusted MOT initial-failure ratio 90.0 is shown separately because raw rates compare fleet age as well as cars.

Compare the Mercedes-Benz CLK with other cars

Ford Kuga is highest at 90.2; Land Rover Freelander is lowest at 89.7 — the gap is 0.5 points.

below 100 is betterabove 100 is worse100 = normal for this model at that age

Same brand

All Mercedes-Benz MOT statisticsMercedes-Benz B-Class MOT statsMercedes-Benz C-Class MOT stats

Similar risk

Ford Kuga (index 90.2)Toyota Yaris (index 89.8)Land Rover Freelander (index 89.7)

Same size class

how Jeep Renegade compareshow Lexus NX compareshow Toyota Verso compares

By build year

Mercedes-Benz CLK 1998Mercedes-Benz CLK 1999Mercedes-Benz CLK 2000Mercedes-Benz CLK 2001Mercedes-Benz CLK 2002Mercedes-Benz CLK 2003Mercedes-Benz CLK 2004Mercedes-Benz CLK 2005Mercedes-Benz CLK 2006Mercedes-Benz CLK 2007Mercedes-Benz CLK 2008Mercedes-Benz CLK 2009Mercedes-Benz CLK 2010

By area

Mercedes-Benz CLK MOT failure rate by postcode area

By failure group

Mercedes-Benz CLK body, chassis and structure failuresMercedes-Benz CLK brakes failuresMercedes-Benz CLK vehicle identification failuresMercedes-Benz CLK lamps, reflectors and electrics failuresMercedes-Benz CLK noise, emissions and leaks failuresMercedes-Benz CLK road wheels failuresMercedes-Benz CLK seat belts and airbags failuresMercedes-Benz CLK steering failuresMercedes-Benz CLK suspension failuresMercedes-Benz CLK tyres failuresMercedes-Benz CLK visibility failures

Inspections abroad

Mercedes-Benz CLK in NorwayMercedes-Benz CLK in FinlandMercedes-Benz CLK in the Netherlands