Mercedes-Benz CL — MOT statistics 2024

The Mercedes-Benz CL failed 22.09% of 3,060 first MOT attempts in 2024 ("first-time", excluding retests). Adjusted for the age of the fleet, its initial-failure ratio is 54.8 (100 = expected for its age profile). This car fails its MOT about 45% less often than expected for its age. Small sample — treat with care.

Age-adjusted peer: Toyota GR Yaris (index 54.7) — the two published results are 0.1 index points apart.

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

Lamps, reflectors and electrical equipment are well below the reference at 12.5 per 100 tests, against 33.4 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 CL MOT advisories: what gets flagged

Brakes are highest at 50.1 per 100 tests; Non-component advisories are lowest at 4.3 per 100 tests — the gap is 45.8 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 3.2 percentage points. The failure most likely to come back is seat belts and supplementary restraint systems — 33.3% 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 15,209 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 (+1.1 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 CL 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 CL perform as it gets older?

The CL at age 17 is well below the reference at 18.1%, against 43.1% 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.

How dangerous are Mercedes-Benz CL MOT failures?

Major defects are well below the reference at 42.8 per 100 tests, against 52.8 per 100 tests nationally.

higher bar = fails more oftenrate per 100 tests

Chart values: Minor 13.1 · Major 42.8 · Dangerous 9.8.

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 CL MOT matter?

May is highest at 24.8%; Sep is lowest at 20.9% — the gap is 3.9 percentage points.

higher = larger sharecompare shares in percentage points

Chart scale: 19%–33%.

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

Takeaway: the spread between best and worst month is 3.9 percentage points — noticeable seasonality. 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 CL average mileage by age

At age 15, the middle half of CLs runs from 66,425 miles to 105,988 miles, against 83,670 miles as the median.

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

Chart axes: car age, years · odometer scale 0–132k mi.

Does high mileage mean more Mercedes-Benz CL 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+, 13.4% of those with under 40,000 miles failed first time versus 28.9% 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 15-year-old CL has ~83,670 miles on the clock. Much more — ask why; much less — check for gaps in the MOT history.

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

Gloucester area is highest at 37.2%; Twickenham area is lowest at 13.2% — the gap is 24.0 percentage points.

higher = larger sharecompare shares in percentage points

Toughest areas	% failing	vs model overall
Gloucester (GL)	37.2%	+14.1 pp
Preston (PR)	33.33%	+10.3 pp
Bristol (BS)	33.02%	+10.0 pp
Norwich (NR)	32.28%	+9.2 pp
Bournemouth (BH)	31.85%	+8.8 pp

Easiest areas	% failing	vs model overall
Twickenham (TW)	13.17%	-9.9 pp
Uxbridge (UB)	13.67%	-9.4 pp
Enfield (EN)	14.57%	-8.5 pp
Romford (RM)	14.86%	-8.2 pp
Leicester (LE)	15.86%	-7.2 pp

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: 14%–32% failing.

Mercedes-Benz CL survival: which cars are still on the road

By age 19 is close to the reference at 100.0%, against 100.0% at the ages 4–6 reference level.

higher = larger sharecompare shares in percentage points

Chart axes: car age, years · survival vs ages 4–6 · scale 0–105%.

By age 19, at least as many cars of this family present for MOT as at ages 4–6 (reference n≈158): the older fleet has not thinned out here, so there is no survivor selection to allow for.

How many miles does a Mercedes-Benz CL last?

100,000+ miles is highest at 36.8%; 150,000+ miles is lowest at 5.9% — the gap is 30.9 percentage points.

higher = larger sharecompare shares in percentage points

Of 15,336 tests of this family with a usable odometer in 2024, 36.8% had reached 100k miles, 5.9% had reached 150k miles. This is a cross-section of cars still presenting for MOT, not a full birth cohort.

How many years is a Mercedes-Benz CL likely to last?

Bought at age 5 is highest at 20.9 years; Bought at age 15 is lowest at 4.5 years — the gap is 16.4 years.

bigger number = longer remaining lifeyears on the observed survival curve

estimateEstimate only — not a warranty: a typical 10-year-old example of this family has at least 9.5 expected years of further MOT-present life. The curve is observed only until age 19, so the true figure is likely higher.

Mercedes-Benz CL faults that come together

Body & structure + Seatbelts & SRS stand out at 7.52×, against 1.00× if the faults were independent.

above 1.0× = more than expectedbelow 1.0× = less

Defects in «Body, chassis, structure» and «Seat belts and supplementary restraint systems» appear together 7.52× more often than chance (30 co-occurrences in the same test; 78 pairs compared).

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 CL?

Cars driven under 5,000 miles a year is well below the reference at 15.8%, against 20.9% 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 15.8% vs 20.9% for 8–12k miles/year — 5.2 pp lower (n_low=1,464, n_normal=1,045). 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.

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

Build year 2006 is highest at 140.1; Build year 2004 is lowest at 94.1 — the gap is 46.0 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 2006 and the weakest is 2006. 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 — 1 of 9 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 CL MOT repair costs

The MOT-failure repair budget per test runs from £75.66 to £143.75, 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 £76 to £144, 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 CL running costs for a fleet

Vehicles failing at age 19 stand out at 21.0%, against 20.0% at age 11, 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 CL rust problems: where they corrode

Age-standardised corrosion susceptibility is well below the reference at 0.79×, against 1.00× for the national age-standardised rate.

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

This Mercedes-Benz CL fails on corrosion at about the average rate once age is held constant, and its owners live in areas that are gentler than most for the models we publish.

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 CL advisory become a failure?

Suspension is highest at 15.3%; Noise, emissions and leaks are lowest at 3.6% — the gap is 11.6 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 15 in 100 cars, and the median gap is 12.1 months and roughly 2,782 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 CL?

Lamps, reflectors and electrical equipment after a failure at age 15-19 are highest at 16.3%; Visibility after a passed at age 15-19 is lowest at 4.1% — the gap is 12.3 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 CL ownership: what six years of MOTs show

The ten-day re-test pass rate is highest at 70.7%; The later re-test pass rate is lowest at 9.0% — the gap is 61.7 percentage points.

higher = larger sharecompare shares in percentage points

Failing is usually a same-week event, not a disaster. Of 2,266 failures followed through to their re-test, 20.39% were repaired and passed the same day and 70.65% within ten days; the median gap is 2 days. 5,171 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 0.691 failures per 10,000 miles, on a median of 2,124 miles a year across 3,806 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. 31.78% of these cars strung together three or more tests with nothing recorded at all, while 24.66% 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: 1.491% of 3,822 chains show a reading lower than the previous test, with a median drop of 20,877 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 CL safety recalls and how to check yours

DVSA recall campaigns stand out at 6.

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

recall campaigns launched per year

DVSA lists 6 safety recall campaigns for the Mercedes-Benz CL, covering roughly 68,001 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 CL MOT: quick answers

Mercedes-Benz CL MOT Risk Index is well below the reference at 54.8, 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 CL first-time MOT pass rate?

77.91% of first attempts passed in 2024 (3,060 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 22.09% figure is the first-time initial failure rate, using 3,060 primary tests as the denominator (first-time, excluding retests). The age-adjusted MOT initial-failure ratio 54.8 is shown separately because raw rates compare fleet age as well as cars.

Compare the Mercedes-Benz CL with other cars

Lexus NX is highest at 55.8; Toyota GR Yaris is lowest at 54.7 — the gap is 1.1 points.

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

Same brand

All Mercedes-Benz MOT statisticsMercedes-Benz S-Class MOT statsMercedes-Benz GL MOT stats

Similar risk

Toyota GR Yaris (index 54.7)Lexus LS (index 55.8)Lexus NX (index 55.8)

Same size class

how Jaguar XJS compareshow Austin Mini compareshow Honda Stepwagon compares

By build year

Mercedes-Benz CL 2001Mercedes-Benz CL 2002Mercedes-Benz CL 2003Mercedes-Benz CL 2004Mercedes-Benz CL 2005Mercedes-Benz CL 2006Mercedes-Benz CL 2007Mercedes-Benz CL 2008Mercedes-Benz CL 2009

By area

Mercedes-Benz CL MOT failure rate by postcode area

By failure group

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