1999 Mercedes-Benz Sl MOT Pass Rate
Pass rate for Sl models manufactured in 1999, based on 3,077 real MOT test results.
Data from official DVSA MOT testing records
This page shows all Sl cars tested in 1999. Want to see how cars built in 1999 hold up over time?
View 1999 Mercedes-Benz Sl vintage page → (83.6% current pass rate)1999 Mercedes-Benz Sl MOT Analysis
The 1999 Mercedes-Benz Sl has an MOT pass rate of 82.4% based on 3,077 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 82,389 miles on the odometer. With a 17.6% failure rate, the 1999 Sl is rated as "Excellent" for MOT reliability.
The leading cause of MOT failure for the 1999 Mercedes-Benz Sl is Suspension, responsible for 8.8% of failures. 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 range from £200–500. Brakes is the second most common issue at 7.8%. Tyres follows at 4.7%.
Top failures specific to 1999 models only. The overall Sl page may show different rankings.
What Fails Most
What Fails on This Car?
Click a category to see specific failure items.
View as table
| Rank | Failure Category | Rate (%) | Count |
|---|---|---|---|
| 1 | Suspension | 8.8% | 270 |
| 2 | Brakes | 7.8% | 239 |
| 3 | Tyres | 4.7% | 145 |
| 4 | Lamps, Reflectors And Electrical Equipment | 4.3% | 132 |
| 5 | Noise, Emissions And Leaks | 1.5% | 47 |
| 6 | Visibility | 1.3% | 40 |
| 7 | Steering | 0.9% | 29 |
| 8 | Body, Chassis, Structure | 0.7% | 23 |
| 9 | Identification Of The Vehicle | 0.6% | 17 |
| 10 | Road Wheels | 0.4% | 12 |
| 11 | Seat Belts And Supplementary Restraint Systems | 0.3% | 10 |
| 12 | Non-component Advisories | 0.2% | 5 |
| 13 | Speedometer And Speed Limiter | 0.1% | 2 |
Failures per 10,000 Miles
avg. 82,389 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 |
|---|---|---|---|
| Suspension | 1.07 | 8.8% | 270 |
| Brakes | 0.94 | 7.8% | 239 |
| Tyres | 0.57 | 4.7% | 145 |
| Lamps & Electrical | 0.52 | 4.3% | 132 |
| Noise, emissions and leaks | 0.19 | 1.5% | 47 |
| Visibility | 0.16 | 1.3% | 40 |
| Steering | 0.11 | 0.9% | 29 |
| Body & Structure | 0.09 | 0.7% | 23 |
| Identification of the vehicle | 0.07 | 0.6% | 17 |
| Wheels | 0.05 | 0.4% | 12 |
| Seat Belts | 0.04 | 0.3% | 10 |
| Non-component advisories | 0.02 | 0.2% | 5 |
| Speedometer and speed limiter | 0.01 | 0.1% | 2 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1999 Mercedes-Benz Sl has an MOT pass rate of 82.4% based on 3,077 tests — well above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 82,389 miles on the odometer. With a 17.6% failure rate, the 1999 Sl is rated as "Excellent" for MOT reliability.
If you own or are considering buying a 1999 Mercedes-Benz Sl, you can expect reliable MOT performance overall. Before your MOT, pay particular attention to suspension: 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. With an average mileage of 82,389 miles, these vehicles are in the higher-mileage bracket where wear-related failures become more common.
Suspension — 8.8% of failures
Suspension issues account for 8.8% of MOT failures on 1999 Mercedes-Benz Sl models. 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.
Brakes — 7.8% of failures
Brakes issues account for 7.8% of MOT failures on 1999 Mercedes-Benz Sl models. 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).
Tyres — 4.7% of failures
Tyres issues account for 4.7% of MOT failures on 1999 Mercedes-Benz Sl models. Tyre failures include tread depth below the legal minimum of 1.6mm, cuts, bulges, exposed cords, and incorrect tyre pressure. Tyres are one of the most common and easiest-to-prevent MOT failures. Typical repair costs: £50–200 per tyre. Pre-MOT check: Check tread depth with a 20p coin — if the outer band is visible, the tyre is too worn. Look for bulges, cuts, or embedded objects. Ensure all tyres match the recommended size and load rating.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.