1971 Mercedes 450sl MOT Pass Rate
Pass rate for 450sl models manufactured in 1971, based on 55 real MOT test results.
Data from official DVSA MOT testing records
1971 Mercedes 450sl MOT Analysis
The 1971 Mercedes 450sl has an MOT pass rate of 67.3% based on 55 tests — slightly above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 97,911 miles on the odometer. With a 32.7% failure rate, the 1971 450sl is rated as "Good" for MOT reliability.
The leading cause of MOT failure for the 1971 Mercedes 450sl is Seat belts and supplementary restraint systems, responsible for 3.6% of failures. 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 range from £50–200 per belt. Lamps, reflectors and electrical equipment is the second most common issue at 1.8%.
Top failures specific to 1971 models only. The overall 450sl 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 | Seat Belts And Supplementary Restraint Systems | 3.6% | 2 |
| 2 | Lamps, Reflectors And Electrical Equipment | 1.8% | 1 |
Failures per 10,000 Miles
avg. 97,911 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.
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| Category | Rate / 10K mi | Raw % | Count |
|---|---|---|---|
| Seat Belts | 0.37 | 3.6% | 2 |
| Lamps & Electrical | 0.19 | 1.8% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1971 Mercedes 450sl has an MOT pass rate of 67.3% based on 55 tests — slightly above the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 97,911 miles on the odometer. With a 32.7% failure rate, the 1971 450sl is rated as "Good" for MOT reliability.
If you own or are considering buying a 1971 Mercedes 450sl, you can expect reliable MOT performance overall. Before your MOT, pay particular attention to seat belts and supplementary restraint systems: 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. With an average mileage of 97,911 miles, these vehicles are in the higher-mileage bracket where wear-related failures become more common.
Seat belts and supplementary restraint systems — 3.6% of failures
Seat belts and supplementary restraint systems issues account for 3.6% of MOT failures on 1971 Mercedes 450sl models. 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.
Lamps, reflectors and electrical equipment — 1.8% of failures
Lamps, reflectors and electrical equipment issues account for 1.8% of MOT failures on 1971 Mercedes 450sl models. 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.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.