Pass rate
86.7%
Above average — 14.5 pts ahead of the 72.2% that cars this age and mileage manage.
Across 6,090 recorded tests.
Typical repair bill £28–£70
2004 Mercedes-Benz Sl MOT pass rate
- 2004
- 3 trims combined
- typical 74,468 mi
Most common fault
Brakes
30.0% of faults · 20.9% nationally
mostly worn pads and discs, corroded pipes and a handbrake that will not hold.
Part only £25–£55 for Rigid brake pipes excessively corroded. What fitting it takes →
6.4 pts down across model years — 7.4% in 2000, 1.0% in 2015.
Which year to buy
- Best 2020 93.7% pass
- Avoid 2010 84.9% pass
Across the 22 years on record, a spread of 8.8 points. See every year →
- First-attempt pass
- 85.1%
- Typical mileage
- 74k mi
The 2004 Mercedes-Benz Sl MOT pass rate is 86.7% of its MOT tests — 14.5 points ahead of what its age and mileage predict. Brakes is the biggest single reason it fails, at 30.0% of what testers record.
Check your postcode
MOT pass rates are national — type your postcode to see how Mercedes-Benz Sl does in your corner of the country.
Expert verdict
Brakes: 1.4× the national share
Brakes make up 30.0% of everything recorded on the 2004 Mercedes-Benz Sl, against 20.9% nationally — 9.1 points above. Have the discs and pads measured rather than glanced at, and ask whether the handbrake holds on a slope.
- 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 86.7% — 14.5 points ahead of what its age and mileage predict.
- When it fails, it costs. Only 33% 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 Sl? Get an email when these numbers change .
Every Mercedes-Benz Sl first registered in 2004 is combined here — 3 trim and body variants in total — so the sample is as large as the DVSA data allows.
How does the 2004 Mercedes-Benz Sl compare?
Cars of this age and mileage average 72.2%, so this figure is 14.5 points ahead of what its age and mileage predict. On a first attempt, before any retests, the figure drops to 85.1%. The median 2004 Mercedes-Benz Sl in this dataset had covered 74,468 mi.
100% of the tests on this vehicle ran on Petrol, which passed 86.7% of the time. Pass rates also shift with the test month: tests recorded October–March passed 86.8% of the time, April–September 86.6%.
The single most recorded failure item is "Windscreen damaged but not adversely affecting driver's view", noted on 2.17% of tests.
- 6,090 recorded tests behind this page.
- 86.7% overall pass rate, 85.1% on a first attempt.
- Across every year of the Mercedes-Benz Sl, the average is 87.2% — best year 2020 (93.7%), worst 2010 (84.9%).
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
- 6,090
- Typical mileage (median)
- 74,468 mi
- Make and model
- Mercedes-Benz Sl
- Updated
- 2026-11-05
Source: DVSA anonymised MOT test data (2023–2025), OGL v3.0.
Top part to budget for
Windscreen
Typically a garage job — get quotes before committing.
Does mileage affect the Sl MOT pass rate?
Pass rate by odometer reading. Bar lengths start at 73% so small gaps stay visible.
Fuel type and reliability
Pass rate by fuel type. Petrol is the most common here (100% of tests).
Regional pass rates for the Sl
| Region | Tests | Pass rate |
|---|---|---|
| South East | 1,715 | 87.6% |
| East of England | 787 | 87.0% |
| South West | 629 | 83.5% |
| North West | 506 | 87.7% |
| West Midlands | 476 | 90.1% |
| Yorkshire | 443 | 86.5% |
| East Midlands | 419 | 86.9% |
| London | 390 | 89.7% |
| Scotland | 323 | 82.0% |
| Wales | 215 | 82.8% |
| North East | 185 | 82.2% |
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 Sl
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 Sl
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 windscreen 2.2% of tests
“windscreen damaged”
Check the driver’s side of the screen within the swept area for chips and cracks; anything larger than 10mm in the driver’s central view is a fail. Most chips can be resin-repaired for far less than a new screen.
-
Check the lights 2.1% of tests
“registration plate lamp(s) inoperative in the case of multiple lamps or light sources”
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 2.0% of tests
“ball joint dust cover severely deteriorated”
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 Sl through its MOT
Across the 10 items that are recorded most often on this model, the average repair comes to £28–£70 — and 33% of those repairs are parts that cost under £30.
- Average repair across the 10 common items
- £28–£70
- Cheapest common item: mirrors slightly damaged
- £3–£15
- Dearest common item: windscreen damaged
- £80–£200
- Common items a careful owner can do at home
- 80%
- Repairs that still cost under £30
- 33%
Estimates from typical UK parts prices, weighted by how often each item appears in 6,090 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 Sl, side by side
22 model years on record, from 2000 to 2021. Across them the pass rate runs from 84.9% to 93.7% — a spread of 8.8 points. The bar under each year is the item that failed it most often.
- 2000 86.5% ball joint dust cover severely…
- 2001 87.4% ball joint dust cover severely…
- 2002 85.2% ball joint dust cover severely…
- 2003 85.2% ball joint dust cover severely…
- 2004 86.7%windscreen damaged but not…
- 2005 86.1% coil spring fractured or broken
- 2006 85.4% coil spring fractured or broken
- 2007 85.5% coil spring fractured or broken
- 2008 86.7% coil spring fractured or broken
- 2009 85.3% coil spring fractured or broken
- 2010 84.9% windscreen damaged but not…
- 2011 88.3% coil spring fractured or broken
- 2012 86.2% has a cut in excess of the…
- 2013 86.2% malfunction indicator lamp…
- 2014 88.8% has a cut in excess of the…
- 2015 89.6% windscreen damaged but not…
- 2016 91.4% has a cut in excess of the…
- 2017 92.2% windscreen damaged but not…
- 2018 92.0% windscreen damaged but not…
- 2019 93.5% has a cut in excess of the…
- 2020 93.7% has a cut in excess of the…
- 2021 88.5% has a cut in excess of the…
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 Sl 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
- Honda S2000 86.7%
- Porsche 911 87.2%
- BMW M3 88.2%
- Bentley Continental 89.2%
- Subaru Impreza 82.2%
- Porsche Boxster 81.5%
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 Sl 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 7,407 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 |
|---|---|---|---|---|
| Brakes | 2,261 | 30.00% | 20.89% | +9.11 |
| Suspension | 1,603 | 21.30% | 20.98% | +0.32 |
| Tyres | 1,460 | 19.40% | 19.76% | −0.36 |
| Lamps, reflectors and electrical equipment | 656 | 8.70% | 12.21% | −3.51 |
| Noise, emissions and leaks | 395 | 5.20% | 5.52% | −0.32 |
| Visibility | 385 | 5.10% | 4.97% | +0.13 |
| Non-component advisories | 194 | 2.60% | 4.18% | −1.58 |
| Steering | 163 | 2.20% | 2.57% | −0.37 |
| Body, chassis, structure | 147 | 2.00% | 5.57% | −3.57 |
| Identification of the vehicle | 143 | 1.90% | 1.76% | +0.14 |
The exact failure items, in the tester's words
| Recorded item | Severity | Tests | Est. cost |
|---|---|---|---|
| Windscreen damaged but not adversely affecting driver's view Visibility | Minor | 2.2% | £80–200 |
| Registration plate lamp(s) inoperative in the case of multiple lamps or light sources Lamps, reflectors and electrical equipment | Minor | 2.1% | £5–20 |
| Ball joint dust cover severely deteriorated Suspension | Minor | 2.0% | £18–45 |
| Coil spring fractured or broken Suspension | Major | 2.0% | £25–65 |
| Ball joint excessively worn Suspension | Major | 1.6% | £18–45 |
| Mirrors slightly damaged Visibility | Minor | 1.4% | £3–15 |
| Ball joint dust cover no longer prevents the ingress of dirt Suspension | Major | 1.3% | £18–45 |
| Rigid brake pipes excessively corroded Brakes | Major | 1.0% | £80–180 |
| Wipers blade defective Visibility | Minor | 0.76% | £8–22 |
| Anti-lock braking system warning lamp indicates an ABS fault Brakes | Major | 0.72% | £3–15 |
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 | 10.6% | £80–180 |
| Tread depth below requirements of 1.6mm Tyres | Advisory | 10.5% | £45–95 |
| Brake discs in such a condition that it is seriously weakened Brakes | Advisory | 7.8% | £45–110 |
| Has a tear, caused by separation or partial failure of its structure Tyres | Advisory | 7.4% | £45–95 |
| Ball joint excessively worn Suspension | Advisory | 5.3% | £18–45 |
| Brake pads less than 1.5 mm thick Brakes | Advisory | 4.7% | £18–45 |
Pass rate by mileage
| Mileage | Tests | Pass rate | Median odometer |
|---|---|---|---|
| 0-30k | 342 | 94.7% | 20,978 mi |
| 30-60k | 1,557 | 90.0% | 46,982 mi |
| 60-90k | 2,232 | 86.6% | 74,672 mi |
| 90-120k | 1,321 | 83.7% | 102,096 mi |
| 120k+ | 609 | 81.3% | 140,576 mi |
Source: 6,090 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 Sl MOT questions
What is the MOT pass rate for a 2004 Mercedes-Benz Sl?
86.7% of the 6,090 2004 Mercedes-Benz Sl tests in this dataset passed, against a national average of 72.2% for cars first used in 2004. First-attempt pass rate: 85.1%.
What are the most common MOT failures on a 2004 Mercedes-Benz Sl?
The three most recorded items are windscreen damaged but not adversely affecting driver's view (2.17%), registration plate lamp(s) inoperative in the case of multiple lamps or light sources (2.10%), ball joint dust cover severely deteriorated (2.02%). Percentages are the share of tests on this vehicle that recorded the item.
Does mileage affect the 2004 Mercedes-Benz Sl MOT pass rate?
Yes. Cars under 30,000 miles passed 94.7% of the time, falling to 81.3% for those over 120,000 miles. The median 2004 Mercedes-Benz Sl in this dataset had covered 74,468 mi.
Which fuel type is most reliable for a 2004 Mercedes-Benz Sl?
Petrol: 86.7% pass rate across 6,078 tests. Diesel: 81.8% pass rate across 11 tests. Shares are of the tests on this vehicle that recorded each fuel type.
Does the season affect the 2004 Mercedes-Benz Sl MOT pass rate?
Tests recorded in the winter months (October–March) passed 86.8% of the time; summer months (April–September) passed 86.6%. Brakes, tyres and lights are tested harder in bad weather, but the difference is small on most models.