Pass rate
75.8%
Around average — 3.6 pts ahead of the 72.2% that cars this age and mileage manage.
Across 11,030 recorded tests.
Typical repair bill £46–£121
2004 Mercedes-Benz Slk MOT pass rate
- 2004
- 2 trims combined
- typical 82,609 mi
Most common fault
Suspension
24.8% of faults · 21.0% nationally
mostly worn arm bushes, split ball-joint boots and broken coil springs.
Part only £35–£75 for Suspension pin or bush excessively worn. What fitting it takes →
0.8 pts down across model years — 2.0% in 2000, 1.2% in 2016.
Which year to buy
- Best 2016 87.2% pass
- Avoid 2004 75.8% pass · this year
Across the 17 years on record, a spread of 11.4 points. See every year →
- First-attempt pass
- 70.1%
- Typical mileage
- 83k mi
The 2004 Mercedes-Benz Slk MOT pass rate is 75.8% of its MOT tests — 3.6 points ahead of what its age and mileage predict. Suspension is the biggest single reason it fails, at 24.8% of what testers record.
Check your postcode
MOT pass rates are national — type your postcode to see how Mercedes-Benz Slk does in your corner of the country.
Expert verdict
Fewer problems with tyres
Tyres are 13.8% of this car’s recorded faults, against 19.8% nationally — the mirror image of the usual story on a car of this age.
- Beats its own age and mileage. Once you allow for how old and how far these cars have been driven, the expected pass rate is 72.2% and this one manages 75.8% — 3.6 points ahead of what its age and mileage predict.
- When it fails, it costs. Only 30% of this model’s typical repairs come in under £30 in parts — the failures here tend to be the kind that need a garage rather than a bulb.
Written from this page's own figures: fault shares against the national composition, the like-for-like pass rate, and the priced repair list. How these are worked out
Watching a Mercedes-Benz Slk? Get an email when these numbers change .
Every Mercedes-Benz Slk first registered in 2004 is combined here — 2 trim and body variants in total — so the sample is as large as the DVSA data allows.
How does the 2004 Mercedes-Benz Slk compare?
Cars of this age and mileage average 72.2%, so this figure is 3.6 points ahead of what its age and mileage predict. On a first attempt, before any retests, the figure drops to 70.1%. The median 2004 Mercedes-Benz Slk in this dataset had covered 82,609 mi.
Pass rates also shift with the test month: tests recorded October–March passed 75.6% of the time, April–September 76.0%.
The single most recorded failure item is "Coil spring fractured or broken", noted on 5.23% of tests.
- 11,030 recorded tests behind this page.
- 75.8% overall pass rate, 70.1% on a first attempt.
- Across every year of the Mercedes-Benz Slk, the average is 79.9% — best year 2016 (87.2%), worst 2004 (75.8%).
Figures count every completed test on this vehicle-year in the dataset, including retests. See methodology for the exact definition.
This page's data
- Tests analysed
- 11,030
- Typical mileage (median)
- 82,609 mi
- Make and model
- Mercedes-Benz Slk
- Updated
- 2026-11-05
Source: DVSA anonymised MOT test data (2023–2025), OGL v3.0.
Top part to budget for
Coil Spring
Usually a DIY or independent-garage job.
Does mileage affect the Slk MOT pass rate?
Pass rate by odometer reading. Bar lengths start at 62% so small gaps stay visible.
Regional pass rates for the Slk
| Region | Tests | Pass rate |
|---|---|---|
| South East | 2,535 | 77.3% |
| East of England | 1,442 | 75.2% |
| South West | 1,325 | 70.6% |
| North West | 1,066 | 76.8% |
| West Midlands | 1,004 | 76.7% |
| Yorkshire | 958 | 75.4% |
| East Midlands | 770 | 76.4% |
| Scotland | 623 | 73.5% |
| London | 511 | 84.7% |
| Wales | 510 | 71.6% |
| North East | 286 | 80.1% |
Regions come from the postcode area recorded at the test station. Areas on region borders are assigned to the region with the majority of their population.
What fails a 2004 Slk
Everything a tester recorded on this vehicle, grouped into the inspection sections that produced it. The notch on each bar is the national share, so you can see at a glance whether this car is unusual or just ordinary.
A test can record several items, so these percentages do not add up to 100%. The exact strings, with prices, are in the full DVSA record at the bottom of this page.
Before your test
Three checks worth doing on a 2004 Slk
These are not generic tips — they are the faults recorded most often on this exact model, rewritten as things you can check yourself. All three take about ten minutes and cost nothing.
-
Check the coil springs 5.2% of tests
“coil spring fractured or broken”
Look up inside each wheel arch with a torch, all the way round the spring. A snapped spring usually breaks at the very bottom coil, where a quick glance will not reach.
-
Check the lights 3.3% of tests
“headlamp lens slightly defective”
Switch everything on and walk round the car: both headlamps on dip and main, every indicator, both brake lights, reverse, fog and the two number-plate lamps. A bulb is a few pounds and a five-minute job.
-
Check the suspension joints 3.2% of tests
“ball joint excessively worn”
With the car parked on level ground, rock the top of each front wheel in and out while someone watches the suspension arm. Clunks, or rubber boots split and greasy, are what testers record here.
Shares are the proportion of tests on this vehicle that recorded the item, so they overlap: one test can record several.
What it costs to get a 2004 Slk through its MOT
Across the 10 items that are recorded most often on this model, the average repair comes to £46–£121 — and 30% of those repairs are parts that cost under £30.
- Average repair across the 10 common items
- £46–£121
- Cheapest common item: malfunction indicator lamp inoperative or…
- £3–£12
- Dearest common item: sub-frame corroded
- £180–£450
- Common items a careful owner can do at home
- 50%
- Repairs that still cost under £30
- 30%
Estimates from typical UK parts prices, weighted by how often each item appears in 11,030 MOT tests on this vehicle. They exclude diagnostics, retest fees and garage labour where the part is a DIY fit, and they are not figures from the DVSA dataset. Older and higher-mileage examples cost more than the average. How these estimates are built → · All MOT repair costs → · Cheapest cars to put through a test →
Every year of the Slk, side by side
17 model years on record, from 2000 to 2016. Across them the pass rate runs from 75.8% to 87.2% — a spread of 11.4 points. The bar under each year is the item that failed it most often.
- 2000 80.3% windscreen damaged but not…
- 2001 80.3% windscreen damaged but not…
- 2002 81.2% headlamp lens slightly defective
- 2003 78.3% coil spring fractured or broken
- 2004 75.8%coil spring fractured or broken
- 2005 76.4% coil spring fractured or broken
- 2006 76.7% coil spring fractured or broken
- 2007 76.8% coil spring fractured or broken
- 2008 77.0% coil spring fractured or broken
- 2009 77.6% coil spring fractured or broken
- 2010 78.6% coil spring fractured or broken
- 2011 82.1% coil spring fractured or broken
- 2012 81.2% coil spring fractured or broken
- 2013 81.5% coil spring fractured or broken
- 2014 83.6% coil spring fractured or broken
- 2015 85.4% coil spring fractured or broken
- 2016 87.2% coil spring fractured or broken
Colour is the pass rate on a fixed scale, so a block means the same thing on any model. Each year links to its own page with the full fault breakdown.
Compare the 2004 Mercedes-Benz Slk with another year
The raw pass rate mostly measures age. The year comparison adds the like-for-like figure, the mileage bands and the repair bill.
Other 2004 cars with a similar record
- BMW 525 75.7%
- Nissan Elgrand 75.7%
- BMW 120 75.7%
- Land Rover Range Rover 76.0%
- Toyota Rav-4 76.0%
- Toyota Hiace 75.6%
Closest pass rates among 2004 cars with at least 2,000 tests, so a small sample cannot flatter itself into the list. See the full rankings: best and worst MOT pass rates.
The full DVSA record for the 2004 Mercedes-Benz Slk 10 failure items · 6 advisories · 10 inspection categories · mileage brackets · all of it in the page, none of it above the fold
Every inspection category
Shares of the 23,257 individual items recorded on this vehicle, and the same share across all cars nationally. A single test can record several items, so a row is not a percentage of tests.
| Category | Items | This car | Nationally | Difference |
|---|---|---|---|---|
| Suspension | 5,834 | 24.80% | 20.98% | +3.82 |
| Brakes | 5,515 | 23.40% | 20.89% | +2.51 |
| Tyres | 3,242 | 13.80% | 19.76% | −5.96 |
| Lamps, reflectors and electrical equipment | 3,004 | 12.70% | 12.21% | +0.49 |
| Noise, emissions and leaks | 1,625 | 6.90% | 5.52% | +1.38 |
| Body, chassis, structure | 1,248 | 5.30% | 5.57% | −0.27 |
| Steering | 987 | 4.20% | 2.57% | +1.63 |
| Visibility | 784 | 3.30% | 4.97% | −1.67 |
| Non-component advisories | 735 | 3.10% | 4.18% | −1.08 |
| Identification of the vehicle | 283 | 1.20% | 1.76% | −0.56 |
The exact failure items, in the tester's words
| Recorded item | Severity | Tests | Est. cost |
|---|---|---|---|
| Coil spring fractured or broken Suspension | Major | 5.2% | £25–65 |
| Headlamp lens slightly defective Lamps, reflectors and electrical equipment | Minor | 3.3% | £5–25 |
| Ball joint excessively worn Suspension | Major | 3.2% | £18–45 |
| Windscreen damaged but not adversely affecting driver's view Visibility | Minor | 2.5% | £80–200 |
| Registration plate lamp(s) inoperative in the case of multiple lamps or light sources Lamps, reflectors and electrical equipment | Minor | 2.5% | £5–20 |
| Steering rack gaiter missing or no longer prevents the ingress of dirt Steering | Major | 2.5% | £120–300 |
| Malfunction indicator lamp inoperative or indicates a malfunction Noise, emissions and leaks | Major | 2.4% | £3–12 |
| Pins and bushes pin or bush excessively worn Suspension | Major | 2.0% | £40–150 |
| Sub-frame corroded and seriously weakened Suspension | Major | 1.7% | £180–450 |
| Rigid brake pipes excessively corroded Brakes | Major | 1.5% | £80–180 |
Severity is as recorded: Major and Dangerous fail the test outright; Minor and Advisory do not. Costs are estimates from typical UK parts prices — see how they are built.
What testers noted without failing the car
Advisories are the early warnings — the same parts a year or two before they fail. Reading them is how you tell a car that has been maintained from one that has been patched.
| Recorded item | Severity | Tests | Est. cost |
|---|---|---|---|
| Rigid brake pipes excessively corroded Brakes | Advisory | 16.3% | £80–180 |
| Tread depth below requirements of 1.6mm Tyres | Advisory | 13.0% | £45–95 |
| Has a tear, caused by separation or partial failure of its structure Tyres | Advisory | 9.1% | £45–95 |
| Brake discs in such a condition that it is seriously weakened Brakes | Advisory | 7.4% | £45–110 |
| Pins and bushes pin or bush excessively worn Suspension | Advisory | 7.0% | £40–150 |
| Engine oil leaks leaking excessively from engine Noise, emissions and leaks | Advisory | 6.8% | £200–700 |
Pass rate by mileage
| Mileage | Tests | Pass rate | Median odometer |
|---|---|---|---|
| 0-30k | 376 | 91.0% | 21,694 mi |
| 30-60k | 2,133 | 81.2% | 47,448 mi |
| 60-90k | 4,077 | 75.9% | 75,490 mi |
| 90-120k | 3,076 | 72.7% | 103,351 mi |
| 120k+ | 1,346 | 70.3% | 139,430 mi |
Source: 11,030 recorded tests on this vehicle-year. Every row above is recomputed from the same DVSA extract as the rest of the page — see the methodology.
2004 Slk MOT questions
What is the MOT pass rate for a 2004 Mercedes-Benz Slk?
75.8% of the 11,030 2004 Mercedes-Benz Slk tests in this dataset passed, against a national average of 72.2% for cars first used in 2004. First-attempt pass rate: 70.1%.
What are the most common MOT failures on a 2004 Mercedes-Benz Slk?
The three most recorded items are coil spring fractured or broken (5.23%), headlamp lens slightly defective (3.30%), ball joint excessively worn (3.17%). Percentages are the share of tests on this vehicle that recorded the item.
Does mileage affect the 2004 Mercedes-Benz Slk MOT pass rate?
Yes. Cars under 30,000 miles passed 91.0% of the time, falling to 70.3% for those over 120,000 miles. The median 2004 Mercedes-Benz Slk in this dataset had covered 82,609 mi.
Does the season affect the 2004 Mercedes-Benz Slk MOT pass rate?
Tests recorded in the winter months (October–March) passed 75.6% of the time; summer months (April–September) passed 76.0%. Brakes, tyres and lights are tested harder in bad weather, but the difference is small on most models.