2004 Mercedes-Benz A-Class MOT Pass Rate
Pass rate for A-Class models manufactured in 2004, based on 7,265 real MOT test results.
Data from official DVSA MOT testing records
This page shows all A-Class cars tested in 2004. Want to see how cars built in 2004 hold up over time?
View 2004 Mercedes-Benz A-Class vintage page → (53.2% current pass rate)2004 Mercedes-Benz A-Class MOT Analysis
The 2004 Mercedes-Benz A-Class has an MOT pass rate of 52.4% based on 7,265 tests — below the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 82,483 miles on the odometer. With a 47.6% failure rate, the 2004 A-Class is rated as "Poor" for MOT reliability.
The leading cause of MOT failure for the 2004 Mercedes-Benz A-Class is Brakes, responsible for 10.1% of failures. 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 range from £150–400. Lamps, reflectors and electrical equipment is the second most common issue at 8.9%. Suspension follows at 8.4%.
Top failures specific to 2004 models only. The overall A-Class 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 | Brakes | 10.1% | 736 |
| 2 | Lamps, Reflectors And Electrical Equipment | 8.9% | 649 |
| 3 | Suspension | 8.4% | 610 |
| 4 | Tyres | 4.3% | 314 |
| 5 | Visibility | 2.3% | 167 |
| 6 | Body, Chassis, Structure | 1.7% | 123 |
| 7 | Non-component Advisories | 1.2% | 85 |
| 8 | Noise, Emissions And Leaks | 1.1% | 81 |
| 9 | Steering | 1.0% | 74 |
| 10 | Identification Of The Vehicle | 1.0% | 74 |
| 11 | Seat Belts And Supplementary Restraint Systems | 0.8% | 59 |
| 12 | Road Wheels | 0.7% | 48 |
Failures per 10,000 Miles
avg. 82,483 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 | 1.23 | 10.1% | 736 |
| Lamps & Electrical | 1.08 | 8.9% | 649 |
| Suspension | 1.02 | 8.4% | 610 |
| Tyres | 0.52 | 4.3% | 314 |
| Visibility | 0.28 | 2.3% | 167 |
| Body & Structure | 0.21 | 1.7% | 123 |
| Non-component advisories | 0.14 | 1.2% | 85 |
| Noise, emissions and leaks | 0.14 | 1.1% | 81 |
| Steering | 0.12 | 1.0% | 74 |
| Identification of the vehicle | 0.12 | 1.0% | 74 |
| Seat Belts | 0.10 | 0.8% | 59 |
| Wheels | 0.08 | 0.7% | 48 |
Mileage Statistics
Mileage-adjusted failure rate — accounts for how much this model year is typically driven.
About This Data
The 2004 Mercedes-Benz A-Class has an MOT pass rate of 52.4% based on 7,265 tests — below the UK average for UK vehicles. Cars of this vintage present for MOT with an average of 82,483 miles on the odometer. With a 47.6% failure rate, the 2004 A-Class is rated as "Poor" for MOT reliability.
If you own or are considering buying a 2004 Mercedes-Benz A-Class, be prepared for above-average maintenance costs. Before your MOT, pay particular attention to brakes: 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). With an average mileage of 82,483 miles, these vehicles are in the higher-mileage bracket where wear-related failures become more common.
Brakes — 10.1% of failures
Brakes issues account for 10.1% of MOT failures on 2004 Mercedes-Benz A-Class 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).
Lamps, reflectors and electrical equipment — 8.9% of failures
Lamps, reflectors and electrical equipment issues account for 8.9% of MOT failures on 2004 Mercedes-Benz A-Class 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.
Suspension — 8.4% of failures
Suspension issues account for 8.4% of MOT failures on 2004 Mercedes-Benz A-Class 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.
Based on DVSA anonymised MOT test data (2005–2024). Crown copyright, Open Government Licence v3.0.