Pass rate
89.6%
Above average — 7.5 pts ahead of the 82.1% that cars this age and mileage manage.
Across 2,594 recorded tests.
Typical repair bill £39–£94
2015 Mercedes-Benz Sl MOT pass rate
- 2015
- 2 trims combined
- typical 37,896 mi
Most common fault
Tyres
43.0% of faults · 19.8% nationally
mostly tread below the limit, cuts and sidewall bulges.
Part only £55–£85 for Tyre has a tear. What fitting it takes →
1.3 pts down across model years — 3.9% in 2000, 2.6% in 2019.
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
- 88.5%
- Typical mileage
- 38k mi
The 2015 Mercedes-Benz Sl MOT pass rate is 89.6% of its MOT tests — 7.5 points ahead of what its age and mileage predict. Tyres is the biggest single reason it fails, at 43.0% 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
Tyres: 2.2× the national share
Tyres make up 43.0% of everything recorded on the 2015 Mercedes-Benz Sl, against 19.8% nationally — 23.2 points above. Check all four tyres yourself, including the inner shoulders, and look at the date stamp — a tyre can pass on tread and still be six years old.
- 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 82.1% and this one manages 89.6% — 7.5 points ahead of what its age and mileage predict.
- When it fails, it costs. Only 20% 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 2015 is combined here — 2 trim and body variants in total — so the sample is as large as the DVSA data allows.
How does the 2015 Mercedes-Benz Sl compare?
Cars of this age and mileage average 82.1%, so this figure is 7.5 points ahead of what its age and mileage predict. On a first attempt, before any retests, the figure drops to 88.5%. The median 2015 Mercedes-Benz Sl in this dataset had covered 37,896 mi.
Pass rates also shift with the test month: tests recorded October–March passed 90.0% of the time, April–September 89.1%.
The single most recorded failure item is "Windscreen damaged but not adversely affecting driver's view", noted on 2.85% of tests.
- 2,594 recorded tests behind this page.
- 89.6% overall pass rate, 88.5% 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
- 2,594
- Typical mileage (median)
- 37,896 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 65% so small gaps stay visible.
Regional pass rates for the Sl
| Region | Tests | Pass rate |
|---|---|---|
| South East | 759 | 89.3% |
| East of England | 379 | 89.2% |
| North West | 273 | 88.6% |
| South West | 227 | 90.7% |
| West Midlands | 214 | 86.9% |
| Yorkshire | 210 | 91.0% |
| East Midlands | 144 | 90.3% |
| Scotland | 135 | 90.4% |
| London | 130 | 90.0% |
| North East | 64 | 89.1% |
| Wales | 59 | 94.9% |
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 2015 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 2015 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 2.9% 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 1.9% of tests
“individual direction indicators with a multiple light source up to 1/2 not functioning”
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 coil springs 1.5% 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.
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 2015 Sl through its MOT
Across the 10 items that are recorded most often on this model, the average repair comes to £39–£94 — and 20% of those repairs are parts that cost under £30.
- Average repair across the 10 common items
- £39–£94
- Cheapest common item: individual direction indicators with a…
- £3–£12
- Dearest common item: windscreen damaged
- £80–£200
- Common items a careful owner can do at home
- 90%
- Repairs that still cost under £30
- 20%
Estimates from typical UK parts prices, weighted by how often each item appears in 2,594 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 2015 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 2015 cars with a similar record
- BMW 1 Series 89.6%
- Porsche Cayenne 89.8%
- MINI Paceman 89.3%
- Honda Cr-V 89.2%
- BMW X6 89.2%
- Porsche Macan 89.1%
Closest pass rates among 2015 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 2015 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 1,583 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 |
|---|---|---|---|---|
| Tyres | 685 | 43.00% | 19.76% | +23.24 |
| Brakes | 279 | 17.50% | 20.89% | −3.39 |
| Suspension | 202 | 12.70% | 20.98% | −8.28 |
| Visibility | 125 | 7.90% | 4.97% | +2.93 |
| Lamps, reflectors and electrical equipment | 94 | 5.90% | 12.21% | −6.31 |
| Road Wheels | 76 | 4.80% | 0.75% | +4.05 |
| Non-component advisories | 41 | 2.60% | 4.18% | −1.58 |
| Identification of the vehicle | 40 | 2.50% | 1.76% | +0.74 |
| Noise, emissions and leaks | 33 | 2.10% | 5.52% | −3.42 |
| Body, chassis, structure | 8 | 0.50% | 5.57% | −5.07 |
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 | 2.9% | £80–200 |
| Individual direction indicators with a multiple light source up to 1/2 not functioning Lamps, reflectors and electrical equipment | Minor | 1.9% | £3–12 |
| Has a cut in excess of the requirements deep enough to reach the ply or cords Tyres | Major | 1.8% | £45–95 |
| Coil spring fractured or broken Suspension | Major | 1.5% | £25–65 |
| Ball joint excessively worn Suspension | Major | 1.0% | £18–45 |
| Has ply or cords exposed Tyres | Major | 0.96% | £45–95 |
| Has a bulge, caused by separation or partial failure of its structure Tyres | Major | 0.89% | £45–95 |
| Wipers blade defective Visibility | Minor | 0.66% | £8–22 |
| Registration plates does not conform to the specified requirements Identification of the vehicle | Major | 0.58% | £20–80 |
| Has a tear, caused by separation or partial failure of its structure Tyres | Major | 0.54% | £45–95 |
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 |
|---|---|---|---|
| Tread depth below requirements of 1.6mm Tyres | Advisory | 10.4% | £45–95 |
| Has a tear, caused by separation or partial failure of its structure Tyres | Advisory | 5.7% | £45–95 |
| Ball joint excessively worn Suspension | Advisory | 4.0% | £18–45 |
| Brake discs in such a condition that it is seriously weakened Brakes | Advisory | 3.0% | £45–110 |
| Brake pads less than 1.5 mm thick Brakes | Advisory | 3.0% | £18–45 |
| Has a cut in excess of the requirements deep enough to reach the ply or cords Tyres | Advisory | 2.8% | £45–95 |
Pass rate by mileage
| Mileage | Tests | Pass rate | Median odometer |
|---|---|---|---|
| 0-30k | 868 | 92.5% | 20,323 mi |
| 30-60k | 1,293 | 89.6% | 42,911 mi |
| 60-90k | 369 | 84.6% | 71,175 mi |
| 90-120k | 49 | 77.6% | 99,683 mi |
| 120k+ | 15 | 73.3% | 139,773 mi |
Source: 2,594 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.
2015 Sl MOT questions
What is the MOT pass rate for a 2015 Mercedes-Benz Sl?
89.6% of the 2,594 2015 Mercedes-Benz Sl tests in this dataset passed, against a national average of 82.1% for cars first used in 2015. First-attempt pass rate: 88.5%.
What are the most common MOT failures on a 2015 Mercedes-Benz Sl?
The three most recorded items are windscreen damaged but not adversely affecting driver's view (2.85%), individual direction indicators with a multiple light source up to 1/2 not functioning (1.93%), has a cut in excess of the requirements deep enough to reach the ply or cords (1.77%). Percentages are the share of tests on this vehicle that recorded the item.
Does mileage affect the 2015 Mercedes-Benz Sl MOT pass rate?
Yes. Cars under 30,000 miles passed 92.5% of the time, falling to 73.3% for those over 120,000 miles. The median 2015 Mercedes-Benz Sl in this dataset had covered 37,896 mi.
Does the season affect the 2015 Mercedes-Benz Sl MOT pass rate?
Tests recorded in the winter months (October–March) passed 90.0% of the time; summer months (April–September) passed 89.1%. Brakes, tyres and lights are tested harder in bad weather, but the difference is small on most models.