Mercedes Sl55 Amg MOT Pass Rate
Overall pass rate across all manufacture years, based on 44 real MOT test results. Failure rate: 9.1%.
Data from official DVSA MOT testing records
Mercedes Sl55 Amg MOT Reliability Overview
The Mercedes Sl55 Amg is a rare vehicle in the UK, with 44 MOT test results recorded in our database spanning 0 manufacture years. It has an overall MOT pass rate of 90.9% and a failure rate of 9.1%, which is well above the UK average of approximately 37%.
Based on this data, the Mercedes Sl55 Amg earns a "Excellent" reliability rating. The average Mercedes Sl55 Amg presents for MOT with approximately 50,980 miles on the clock.
The most common MOT failure for the Mercedes Sl55 Amg is Brakes, affecting 15.9% 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 Suspension at 11.4%. Seat belts and supplementary restraint systems rounds out the top three at 4.5%. 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
* 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 | Brakes | 15.9% | 7 |
| 2 | Suspension | 11.4% | 5 |
| 3 | Seat Belts And Supplementary Restraint Systems | 4.5% | 2 |
Failures per 10,000 Miles
avg. 50,980 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 |
|---|---|---|---|
| Brakes | 3.12 | 15.9% | 7 |
| Suspension | 2.23 | 11.4% | 5 |
| Seat Belts | 0.89 | 4.5% | 2 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Mercedes Sl55 Amg has 50,980 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 Sl55 Amg has a mileage-adjusted failure rate of 1.79% per 10,000 miles driven. The average across all makes is 5.38%, so this model is better than average.
About Mercedes Sl55 Amg MOT Data
The Mercedes Sl55 Amg is a rare vehicle in the UK, with 44 MOT test results recorded in our database spanning 0 manufacture years. It has an overall MOT pass rate of 90.9% and a failure rate of 9.1%, which is well above the UK average of approximately 37%.
For Mercedes Sl55 Amg owners, these results suggest a reliable vehicle that generally passes its MOT without major issues. Focus your pre-MOT checks on brakes and suspension 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 Sl55 Amg is likely to perform.
Brakes — 15.9% of failures
Brakes issues account for 15.9% of MOT failures on the Mercedes Sl55 Amg. 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).
Suspension — 11.4% of failures
Suspension issues account for 11.4% of MOT failures on the Mercedes Sl55 Amg. Suspension failures typically involve worn bushes, leaking shock absorbers, broken coil springs, and damaged suspension arms. These affect ride quality, tyre wear, and road holding. Typical repair costs: £200–500. Pre-MOT check: Look for uneven tyre wear, listen for clunking over bumps, and check if the car pulls to one side. A bouncy ride suggests worn shock absorbers. Visually inspect coil springs for cracks.
Seat belts and supplementary restraint systems — 4.5% of failures
Seat belts and supplementary restraint systems issues account for 4.5% of MOT failures on the Mercedes Sl55 Amg. Seat belt failures include frayed or cut webbing, faulty retractors, buckles that don't latch properly, and missing or damaged anchorages. All fitted seat belts must be functional. Typical repair costs: £50–200 per belt. Pre-MOT check: Pull each seat belt fully out and check for fraying, cuts, or fading. Ensure each belt retracts smoothly and the buckle clicks securely. Check the pre-tensioner warning light on the dashboard.
Frequently Asked Questions
What is the MOT pass rate for the Mercedes Sl55 Amg?
Based on 44 (based on limited data) MOT tests in our database, the Mercedes Sl55 Amg has an overall pass rate of 90.9% (9.1% fail rate).
What are the most common MOT failures on a Mercedes Sl55 Amg?
The top 3 reasons a Mercedes Sl55 Amg fails its MOT are: 1. Brakes (15.9%), 2. Suspension (11.4%), 3. Seat belts and supplementary restraint systems (4.5%). Check these areas before booking your MOT.
Is the Mercedes Sl55 Amg reliable?
With a 9.1% MOT failure rate, the Sl55 Amg is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Mercedes Sl55 Amg?
Based on failure data, focus on: Brakes (15.9%); Suspension (11.4%); Seat belts and supplementary restraint systems (4.5%). 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.