Mercedes R320 MOT Pass Rate
Overall pass rate across all manufacture years, based on 33 real MOT test results. Failure rate: 24.2%.
Data from official DVSA MOT testing records
Mercedes R320 MOT Reliability Overview
The Mercedes R320 is a rare vehicle in the UK, with 33 MOT test results recorded in our database spanning 0 manufacture years. It has an overall MOT pass rate of 75.8% and a failure rate of 24.2%, which is well above the UK average of approximately 37%.
Based on this data, the Mercedes R320 earns a "Excellent" reliability rating. The average Mercedes R320 presents for MOT with approximately 86,218 miles on the clock.
The most common MOT failure for the Mercedes R320 is Brakes, affecting 33.3% of all tests. 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. The second most common issue is Tyres at 15.2%. Body, chassis, structure rounds out the top three at 15.2%. 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 | Brakes | 33.3% | 11 |
| 2 | Tyres | 15.2% | 5 |
| 3 | Body, Chassis, Structure | 15.2% | 5 |
| 4 | Suspension | 12.1% | 4 |
| 5 | Lamps, Reflectors And Electrical Equipment | 12.1% | 4 |
| 6 | Exhaust, Fuel And Emissions | 6.1% | 2 |
| 7 | Non-component Advisories | 3.0% | 1 |
Failures per 10,000 Miles
avg. 86,218 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 | 3.87 | 33.3% | 11 |
| Tyres | 1.76 | 15.2% | 5 |
| Body & Structure | 1.76 | 15.2% | 5 |
| Suspension | 1.41 | 12.1% | 4 |
| Lamps & Electrical | 1.41 | 12.1% | 4 |
| Emissions & Exhaust | 0.70 | 6.1% | 2 |
| Non-component advisories | 0.35 | 3.0% | 1 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Mercedes R320 has 86,218 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 R320 has a mileage-adjusted failure rate of 2.81% per 10,000 miles driven. The average across all makes is 5.38%, so this model is better than average.
About Mercedes R320 MOT Data
The Mercedes R320 is a rare vehicle in the UK, with 33 MOT test results recorded in our database spanning 0 manufacture years. It has an overall MOT pass rate of 75.8% and a failure rate of 24.2%, which is well above the UK average of approximately 37%.
For Mercedes R320 owners, these results suggest a reliable vehicle that generally passes its MOT without major issues. Focus your pre-MOT checks on brakes and tyres 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 R320 is likely to perform.
Brakes — 33.3% of failures
Brakes issues account for 33.3% of MOT failures on the Mercedes R320. 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 — 15.2% of failures
Tyres issues account for 15.2% of MOT failures on the Mercedes R320. 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.
Body, chassis, structure — 15.2% of failures
Body, chassis, structure issues account for 15.2% of MOT failures on the Mercedes R320. Body and structure failures include excessive corrosion, sharp edges, loose panels, and damage to the vehicle frame. Rust is the primary concern, especially on older vehicles or those exposed to road salt. Typical repair costs: £100–500+. Pre-MOT check: Inspect sills, wheel arches, door bottoms, and the chassis for rust. Surface rust is acceptable but structural corrosion or holes will fail. Check that all doors, bonnet, and boot close securely.
Frequently Asked Questions
What is the MOT pass rate for the Mercedes R320?
Based on 33 (based on limited data) MOT tests in our database, the Mercedes R320 has an overall pass rate of 75.8% (24.2% fail rate).
What are the most common MOT failures on a Mercedes R320?
The top 3 reasons a Mercedes R320 fails its MOT are: 1. Brakes (33.3%), 2. Tyres (15.2%), 3. Body, chassis, structure (15.2%). Check these areas before booking your MOT.
Is the Mercedes R320 reliable?
With a 24.2% MOT failure rate, the R320 is more reliable than average compared to the UK average of ~40%.
What should I check before an MOT on my Mercedes R320?
Based on failure data, focus on: Brakes (33.3%); Tyres (15.2%); Body, chassis, structure (15.2%). 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.