1997 Mercedes 300 MOT Pass Rate
Pass rate for 300 models manufactured in 1997, based on 117 real MOT test results.
Data from official DVSA MOT testing records
1997 Mercedes 300 MOT Analysis
The 1997 Mercedes 300 has an MOT pass rate of 60.7% based on 117 tests — around the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 159,600 miles on the odometer. With a 39.3% failure rate, the 1997 300 is rated as "Average" for MOT reliability.
The leading cause of MOT failure for the 1997 Mercedes 300 is Seat Belts and Supplementary Restraint Systems, responsible for 3.4% 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 1.7%. Tyres follows at 1.7%.
Top failures specific to 1997 models only. The overall 300 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 | 3.4% | 4 |
| 2 | Lamps, Reflectors And Electrical Equipment | 1.7% | 2 |
| 3 | Tyres | 1.7% | 2 |
| 4 | Suspension | 0.9% | 1 |
| 5 | Brakes | 0.9% | 1 |
| 6 | Driver's View Of The Road | 0.9% | 1 |
Failures per 10,000 Miles
avg. 159,600 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 |
|---|---|---|---|
| Seat Belts | 0.21 | 3.4% | 4 |
| Lamps & Electrical | 0.11 | 1.7% | 2 |
| Tyres | 0.11 | 1.7% | 2 |
| Suspension | 0.05 | 0.9% | 1 |
| Brakes | 0.05 | 0.9% | 1 |
| Visibility | 0.05 | 0.9% | 1 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 1997 Mercedes 300 has an MOT pass rate of 60.7% based on 117 tests — around the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 159,600 miles on the odometer. With a 39.3% failure rate, the 1997 300 is rated as "Average" for MOT reliability.
If you own or are considering buying a 1997 Mercedes 300, budget for potential repairs before each MOT. 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 159,600 miles, these vehicles are in the higher-mileage bracket where wear-related failures become more common.
Seat Belts and Supplementary Restraint Systems — 3.4% of failures
Seat Belts and Supplementary Restraint Systems issues account for 3.4% of MOT failures on 1997 Mercedes 300 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 — 1.7% of failures
Lamps, Reflectors and Electrical Equipment issues account for 1.7% of MOT failures on 1997 Mercedes 300 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.
Tyres — 1.7% of failures
Tyres issues account for 1.7% of MOT failures on 1997 Mercedes 300 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.