Mercedes Slk55 MOT Pass Rate
Overall pass rate across all manufacture years, based on 39 real MOT test results. Failure rate: 15.4%.
Data from official DVSA MOT testing records
Mercedes Slk55 MOT Reliability Overview
The Mercedes Slk55 is a rare vehicle in the UK, with 39 MOT test results recorded in our database spanning 1 manufacture years. It has an overall MOT pass rate of 84.6% and a failure rate of 15.4%, which is well above the UK average of approximately 37%.
Based on this data, the Mercedes Slk55 earns a "Excellent" reliability rating. The average Mercedes Slk55 presents for MOT with approximately 46,456 miles on the clock. The 2005 manufacture year performs best with a 84.6% pass rate.
The most common MOT failure for the Mercedes Slk55 is Brakes, affecting 15.4% of all tests. Brake-related failures include worn brake pads, corroded brake discs, leaking brake lines, and faulty brake servos. These are safety-critical components — any brake deficiency will result in an MOT fail. The second most common issue is Lamps, reflectors and electrical equipment at 5.1%. Registration Plates and VIN rounds out the top three at 5.1%. Together, these top 3 failure categories account for a significant portion of all MOT failures for this model.
Top failures across all manufacture years combined. Individual year pages may show different top failures.
What Fails Most
Pass Rate by Manufacture Year
* High Fail Rate badge indicates an MOT pass rate below 65% (failure rate above 35%).
What Fails on This Car?
Click a category to see specific failure items.
View as table
| Rank | Failure Category | Rate (%) | Count |
|---|---|---|---|
| 1 | Registration Plates And Vin | 20.5% | 8 |
| 2 | Brakes | 17.9% | 7 |
| 3 | Lamps, Reflectors And Electrical Equipment | 7.7% | 3 |
| 4 | Suspension | 5.1% | 2 |
| 5 | Visibility | 2.6% | 1 |
| 6 | Driver's View Of The Road | 2.6% | 1 |
| 7 | Tyres | 2.6% | 1 |
Failures per 10,000 Miles
avg. 46,456 miFor every 10,000 miles driven, this shows what percentage of MOT tests fail for each category. This accounts for how far cars are actually driven, not just raw pass/fail counts.
View as table
| Category | Rate / 10K mi | Raw % | Count |
|---|---|---|---|
| Registration Plates and VIN | 4.42 | 20.5% | 8 |
| Brakes | 3.86 | 17.9% | 7 |
| Lamps & Electrical | 1.65 | 7.7% | 3 |
| Suspension | 1.10 | 5.1% | 2 |
| Visibility | 1.10 | 5.2% | 2 |
| Tyres | 0.55 | 2.6% | 1 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Mercedes Slk55 has 46,456 miles when tested for MOT.
📊 Mileage-Adjusted Failure Rate
How often this car fails MOT relative to how much it's driven — a fairer comparison than raw pass rate.
The Mercedes Slk55 has a mileage-adjusted failure rate of 3.31% per 10,000 miles driven. The average across all makes is 5.38%, so this model is better than average.
About Mercedes Slk55 MOT Data
The Mercedes Slk55 is a rare vehicle in the UK, with 39 MOT test results recorded in our database spanning 1 manufacture years. It has an overall MOT pass rate of 84.6% and a failure rate of 15.4%, which is well above the UK average of approximately 37%.
For Mercedes Slk55 owners, these results suggest a reliable vehicle that generally passes its MOT without major issues. Focus your pre-MOT checks on brakes and lamps, reflectors and electrical equipment for the best chance of a first-time pass. Use our detailed year-by-year breakdown and failure analysis below to understand how your specific Slk55 is likely to perform.
Brakes — 15.4% of failures
Brakes issues account for 15.4% of MOT failures on the Mercedes Slk55. Brake-related failures include worn brake pads, corroded brake discs, leaking brake lines, and faulty brake servos. These are safety-critical components — any brake deficiency will result in an MOT fail. Typical repair costs: £150–400. Pre-MOT check: Listen for squealing or grinding noises. Check brake pedal feel — if it feels spongy or goes to the floor, have the system inspected immediately. Look at brake pad thickness through the wheel spokes (minimum 3mm).
Lamps, reflectors and electrical equipment — 5.1% of failures
Lamps, reflectors and electrical equipment issues account for 5.1% of MOT failures on the Mercedes Slk55. Lighting failures cover all external lights: headlights, tail lights, brake lights, indicators, fog lights, and reflectors. A single blown bulb will cause an MOT fail. This is one of the most preventable failure categories. Typical repair costs: £5–50. Pre-MOT check: Walk around the car and check every light — headlights (dipped and main beam), side lights, tail lights, brake lights, indicators, hazard lights, reverse light, rear fog light, and number plate lights. Replace any blown bulbs before the test.
Registration Plates and VIN — 5.1% of failures
Registration Plates and VIN issues account for 5.1% of MOT failures on the Mercedes Slk55. Registration Plates and VIN issues are a common cause of MOT failure. Regular inspection and maintenance of these components helps ensure your vehicle passes its MOT. Typical repair costs: £100–400. Pre-MOT check: Have this system checked during regular servicing. Look for warning signs like unusual noises, vibrations, or dashboard warning lights.
Frequently Asked Questions
What is the MOT pass rate for the Mercedes Slk55?
Based on 39 (based on limited data) MOT tests in our database, the Mercedes Slk55 has an overall pass rate of 84.6% (15.4% fail rate).
What are the most common MOT failures on a Mercedes Slk55?
The top 3 reasons a Mercedes Slk55 fails its MOT are: 1. Brakes (15.4%), 2. Lamps, reflectors and electrical equipment (5.1%), 3. Registration Plates and VIN (5.1%). Check these areas before booking your MOT.
Is the Mercedes Slk55 reliable?
With a 15.4% MOT failure rate, the Slk55 is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Mercedes Slk55?
Based on failure data, focus on: Brakes (15.4%); Lamps, reflectors and electrical equipment (5.1%); Registration Plates and VIN (5.1%). These are the areas most likely to cause a fail. Also check all lights, tyres (minimum 1.6mm tread), and windscreen condition — these are quick wins that apply to all cars.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.