Mercedes Benz Slk car check
Find out if a Mercedes Benz Slk has outstanding finance, has been written off or stolen, how many owners it’s had, and which known problems apply to the generation you’re looking at.
Finance, stolen, write-off and owner history data provided by Experian. Results in under a minute.
- Typical price
- £7,916121 at dealers
- MOT failure rate
- 19%281k tests
- Known problems
- 5across R170 to R172
- Full report
- £7.49one-off, no subscription
Which Slk are you looking at?
Each Slk generation has its own weak spots. Pick the one you’re viewing to see what to check.
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Flexible brake hose deterioration
Safety risk R170, R171, R172The flexible brake hoses connecting the rigid brake lines to the brake calipers deteriorate at an exceptional rate on SLK models. These rubber hoses are subject to constant flexing as the suspension moves and the steering turns, causing internal breakdown that can block brake fluid flow or create external leaks. MOT data shows this model fails at up to 58 times the national fleet average for brake hose defects, affecting all engine variants and mileage ranges including surprisingly low-mileage examples.
What to check: Visually inspect all four brake hoses where they connect to the brake calipers - look for cracks, bulging, or weeping brake fluid around the hose fittings. Check the brake fluid level in the master cylinder reservoir - significant loss indicates leakage somewhere in the system. Look for brake flu...
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Wheel bearing excessive play
Safety risk R170, R171, R172SLK models experience wheel bearing failure at dramatically higher rates than typical passenger cars, with MOT data showing up to 29 times the fleet average failure rate. The combination of the car's sporting suspension setup, wider tyres, and the additional stresses from the convertible body structure contribute to accelerated bearing wear. Failed wheel bearings create dangerous handling characteristics and can lead to wheel detachment in extreme cases.
What to check: Jack up each corner of the car and grab the wheel at the 12 and 6 o'clock positions - rock it firmly up and down to check for vertical play. Repeat at the 3 and 9 o'clock positions to check for horizontal play. Any noticeable movement or clicking sounds indicate bearing wear. Spin each wheel by h...
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Excessive steering free play
Wear item R170, R171The SLK steering rack develops excessive free play at the steering wheel rim, measuring significantly beyond MOT limits. This affects road holding precision and creates an unsafe disconnected feeling between steering input and wheel response. The rack assembly uses a complex hydraulic assistance system that wears internally over time. MOT data shows this model fails at up to 101 times the national fleet average for excessive steering play, with the highest failure rates on early R170 variants.
What to check: With the car on level ground and engine off, grip the steering wheel at the 3 and 9 o'clock positions. Gently rock the wheel left and right without turning it - there should be minimal movement before the front wheels begin to respond. Excessive free play feels like the first inch or more of stee...
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Suspension component damage and corrosion
Wear item R170, R171, R172The SLK's complex multi-link suspension system is prone to component damage and corrosion affecting control arms, wishbones, and mounting points. The low ride height and sporting setup expose these components to road debris and salt damage. MOT data shows failure rates up to 28 times the national average, with corrosion particularly affecting the rear suspension subframe mounting points where structural integrity can be compromised.
What to check: Inspect the visible suspension arms and mounting points for obvious corrosion, cracking, or damage - pay particular attention to the rear subframe where it meets the body. Look for oil weeping from shock absorber bodies or springs that appear to have shifted position. Check for any components tha...
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Suspension bush wear
Wear item R170, R171, R172The rubber suspension bushes in the SLK's multi-link setup deteriorate faster than typical family cars due to the firmer suspension settings and wider tyres that transmit more road forces. MOT data shows failure rates up to 27 times the national average for worn suspension joints and bushes. The complex rear suspension uses multiple bushes per wheel that work together to control wheel movement and maintain alignment.
What to check: Inspect visible suspension bushes for cracking, splitting, or separation from their metal housing - look particularly at the lower control arm bushes which are most accessible. Check for any bushes that appear to have shifted position or are no longer centered in their mountings. Look for oil or ...
We haven’t flagged any common problems for this generation in our data yet. A history check still tells you about finance, write-offs and theft, and the MOT history shows how this particular car has been looked after.
What Slks cost at dealers now
From 121 used Slks we track on UK dealer websites.
- Typical asking price
- £7,916
- Typical mileage
- 71,821 miles
- Price change vs last month
- +24.1%
Slk MOT results
of Slk MOT tests end in a fail, from 280,950 tests.
Most common reasons for failing
- Steering rack wearSteering
- Suspension pin, bush or joint wornSuspension
- Light unit faultLights & Electrics
Check the Slk you’re buying
One report covers outstanding finance, write-offs, theft and previous owners from Experian, plus MOT history, mileage and the known problems for its generation.
Finance, stolen, write-off and owner history data provided by Experian.
What the check includes
- Outstanding finance Experian
- Write-off status Experian
- Stolen vehicle check Experian
- Previous owners and keeper history Experian
- MOT history and advisories DVSA
- Mileage check DVSA
- Known problems for its generation GetCarWise
- How many are left on the road DVLA
Slk questions
Is the Mercedes Benz Slk reliable?
19% of Slk models fail their MOT based on 280,950 tests analysed. That’s about average for the class. There are 5 known problems to watch for, the most serious being flexible brake hose deterioration. A full history check shows whether a specific car has had related write-offs or insurance claims.
What are the main problems with a Mercedes Benz Slk?
The most serious known issues are flexible brake hose deterioration, wheel bearing excessive play, excessive steering free play. Problems vary by generation, so check which apply to the year you’re looking at. Our car check flags whether a specific Slk has been written off or had insurance claims linked to these faults.
How do I check if a Mercedes Benz Slk has outstanding finance?
Enter the registration on this page. We query Experian’s finance database and return any outstanding agreements within a minute. If finance is still owed, the finance company can legally repossess the car even after you’ve paid the seller. At £7.49 it’s the cheapest way to avoid a car that isn’t legally for sale.
How do I check if a Mercedes Benz Slk has been written off?
Our check queries Experian’s insurance write-off database for Cat A, B, S and N markers. A Cat S or N Slk has been structurally or non-structurally damaged and repaired. This doesn’t mean it’s unsafe, but it affects resale value and some insurers won’t cover it. The check costs £7.49.
Can I check a Mercedes Benz Slk for free?
You can check MOT history free on GOV.UK, which shows past test results and advisories. What it won’t show is outstanding finance, write-offs or theft markers, which are the things that actually cost you money after you’ve bought. Our full check adds all of that for £7.49, using Experian data.
Is a Mercedes Benz Slk HPI check worth it?
HPI is one brand of car check. Our check uses the same Experian data covering finance, stolen, write-off and keeper history, plus MOT analysis and known Slk faults that HPI doesn’t include. At £7.49 it’s typically less than half the price of an HPI check.
What does a Mercedes Benz Slk fail its MOT on?
The most common MOT failure on the Slk is steering rack wear. 19% of Slk models fail overall, based on 280,950 tests. Checking a car’s full MOT history before buying shows you recurring problems the seller might not mention.
More on the Slk
Other Mercedes Benz car checks
Finance, stolen, write-off and owner history data provided by Experian. MOT data from DVSA. Known problems from GetCarWise analysis. Updated October 2026.