Mercedes 300 Gd A4 MOT Pass Rate
Overall pass rate across all manufacture years, based on 56 real MOT test results. Failure rate: 37.5%.
Data from official DVSA MOT testing records
Mercedes 300 Gd A4 MOT Reliability Overview
The Mercedes 300 Gd A4 is a rare vehicle in the UK, with 56 MOT test results recorded in our database spanning 0 manufacture years. It has an overall MOT pass rate of 62.5% and a failure rate of 37.5%, which is around the UK average of approximately 37%.
Based on this data, the Mercedes 300 Gd A4 earns a "Average" reliability rating. The average Mercedes 300 Gd A4 presents for MOT with approximately 63,818 miles on the clock.
The most common MOT failure for the Mercedes 300 Gd A4 is Lamps, Reflectors and Electrical Equipment, affecting 33.9% of all tests. 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. The second most common issue is Suspension at 23.2%. Steering rounds out the top three at 19.6%. 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 | Lamps, Reflectors And Electrical Equipment | 50.0% | 28 |
| 2 | Suspension | 26.8% | 15 |
| 3 | Steering | 23.2% | 13 |
| 4 | Brakes | 21.4% | 12 |
| 5 | Body, Structure And General Items | 19.6% | 11 |
| 6 | Exhaust, Fuel And Emissions | 10.7% | 6 |
| 7 | Driver's View Of The Road | 8.9% | 5 |
| 8 | Seat Belts And Supplementary Restraint Systems | 8.9% | 5 |
| 9 | Registration Plates And Vin | 3.6% | 2 |
| 10 | Tyres | 1.8% | 1 |
| 11 | Towbars | 1.8% | 1 |
Failures per 10,000 Miles
avg. 63,818 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 |
|---|---|---|---|
| Lamps & Electrical | 7.83 | 50.0% | 28 |
| Suspension | 4.20 | 26.8% | 15 |
| Steering | 3.64 | 23.2% | 13 |
| Brakes | 3.36 | 21.4% | 12 |
| Body & Structure | 3.08 | 19.6% | 11 |
| Emissions & Exhaust | 1.68 | 10.7% | 6 |
| Visibility | 1.40 | 8.9% | 5 |
| Seat Belts | 1.40 | 8.9% | 5 |
| Registration Plates and VIN | 0.56 | 3.6% | 2 |
| Tyres | 0.28 | 1.8% | 1 |
| Towbars | 0.28 | 1.8% | 1 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Mercedes 300 Gd A4 has 63,818 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 300 Gd A4 has a mileage-adjusted failure rate of 5.88% per 10,000 miles driven. The average across all makes is 5.38%, so this model is worse than average.
About Mercedes 300 Gd A4 MOT Data
The Mercedes 300 Gd A4 is a rare vehicle in the UK, with 56 MOT test results recorded in our database spanning 0 manufacture years. It has an overall MOT pass rate of 62.5% and a failure rate of 37.5%, which is around the UK average of approximately 37%.
For Mercedes 300 Gd A4 owners, these results suggest average reliability — some preparation before MOT can improve pass chances. Focus your pre-MOT checks on lamps, reflectors and electrical equipment 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 300 Gd A4 is likely to perform.
Lamps, Reflectors and Electrical Equipment — 33.9% of failures
Lamps, Reflectors and Electrical Equipment issues account for 33.9% of MOT failures on the Mercedes 300 Gd A4. 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 — 23.2% of failures
Suspension issues account for 23.2% of MOT failures on the Mercedes 300 Gd A4. 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.
Steering — 19.6% of failures
Steering issues account for 19.6% of MOT failures on the Mercedes 300 Gd A4. Steering failures include excessive play in the steering wheel, leaking power steering fluid, worn track rod ends, and damaged steering rack. These affect vehicle control and are closely related to suspension wear. Typical repair costs: £150–600. Pre-MOT check: Check for excessive steering wheel play (more than a few inches of free movement). Listen for whining from the power steering pump. Look for fluid leaks under the car near the front wheels.
Frequently Asked Questions
What is the MOT pass rate for the Mercedes 300 Gd A4?
Based on 56 (based on limited data) MOT tests in our database, the Mercedes 300 Gd A4 has an overall pass rate of 62.5% (37.5% fail rate).
What are the most common MOT failures on a Mercedes 300 Gd A4?
The top 3 reasons a Mercedes 300 Gd A4 fails its MOT are: 1. Lamps, Reflectors and Electrical Equipment (33.9%), 2. Suspension (23.2%), 3. Steering (19.6%). Check these areas before booking your MOT.
Is the Mercedes 300 Gd A4 reliable?
With a 37.5% MOT failure rate, the 300 Gd A4 is about average compared to the UK average of ~40%.
What should I check before an MOT on my Mercedes 300 Gd A4?
Based on failure data, focus on: Lamps, Reflectors and Electrical Equipment (33.9%); Suspension (23.2%); Steering (19.6%). 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.