Mercedes Sprinter 309 Cdi Mwb MOT Pass Rate
Overall pass rate across all manufacture years, based on 1,205 real MOT test results. Failure rate: 38.7%.
Data from official DVSA MOT testing records
Mercedes Sprinter 309 Cdi Mwb MOT Reliability Overview
The Mercedes Sprinter 309 Cdi Mwb is a niche vehicle in the UK, with 1,205 MOT test results recorded in our database spanning 4 manufacture years. It has an overall MOT pass rate of 61.3% and a failure rate of 38.7%, which is around the UK average of approximately 37%.
Based on this data, the Mercedes Sprinter 309 Cdi Mwb earns a "Average" reliability rating. The average Mercedes Sprinter 309 Cdi Mwb presents for MOT with approximately 124,237 miles on the clock. Manufacture year matters: 2006 models achieve the highest pass rate at 68.4%, while 2009 models have the lowest at 46.2%. This 22.2 percentage point difference suggests notable variation in build quality or component durability across production years.
The most common MOT failure for the Mercedes Sprinter 309 Cdi Mwb is Lamps, Reflectors and Electrical Equipment, affecting 37.6% 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 Brakes at 35.9%. Suspension rounds out the top three at 32.0%. 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
Best Year to Buy
📈 How Each Vintage Ages
📉 How Age Affects Reliability
MOT failure rate by vehicle age for the Mercedes Sprinter 309 Cdi Mwb. The dashed red line marks when the manufacturer warranty typically expires (3 years).
Line chart showing MOT failure rate by vehicle age from 3 to 8 years, with warranty expiry marked at 3 years.
💡 What does the warranty cliff mean?
The Mercedes Sprinter 309 Cdi Mwb actually sees a 5% decrease in failure rate after the warranty period. This is likely due to survivorship bias — unreliable cars are already off the road by this age. Peak failure occurs at age 4 (47.0% fail rate).
Note: pass rates may improve for very old vehicles due to survivorship bias — only well-maintained cars remain on the road.
Pass Rate by Manufacture Year
* 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 | 47.1% | 568 |
| 2 | Suspension | 43.9% | 529 |
| 3 | Brakes | 43.8% | 528 |
| 4 | Steering | 14.5% | 175 |
| 5 | Driver's View Of The Road | 10.0% | 120 |
| 6 | Tyres | 8.5% | 102 |
| 7 | Body, Structure And General Items | 3.4% | 41 |
| 8 | Seat Belts And Supplementary Restraint Systems | 2.7% | 33 |
| 9 | Registration Plates And Vin | 2.2% | 26 |
| 10 | Exhaust, Fuel And Emissions | 1.2% | 15 |
| 11 | Non-component Advisories | 0.8% | 10 |
| 12 | Items Not Tested | 0.4% | 5 |
| 13 | Road Wheels | 0.4% | 5 |
| 14 | Driving Controls And Speed Limiters | 0.2% | 2 |
Failures per 10,000 Miles
avg. 124,237 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 | 3.79 | 47.1% | 568 |
| Suspension | 3.53 | 43.9% | 529 |
| Brakes | 3.53 | 43.8% | 528 |
| Steering | 1.17 | 14.5% | 175 |
| Visibility | 0.80 | 10.0% | 120 |
| Tyres | 0.68 | 8.5% | 102 |
| Body & Structure | 0.27 | 3.4% | 41 |
| Seat Belts | 0.22 | 2.7% | 33 |
| Registration Plates and VIN | 0.17 | 2.2% | 26 |
| Emissions & Exhaust | 0.10 | 1.2% | 15 |
| Non-component advisories | 0.07 | 0.8% | 10 |
| Items Not Tested | 0.03 | 0.4% | 5 |
| Wheels | 0.03 | 0.4% | 5 |
| Driving Controls and Speed Limiters | 0.01 | 0.2% | 2 |
🚗 Similar Cars to Consider
Mileage at MOT
The average Mercedes Sprinter 309 Cdi Mwb has 124,237 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 Sprinter 309 Cdi Mwb has a mileage-adjusted failure rate of 3.12% per 10,000 miles driven. The average across all makes is 5.38%, so this model is better than average.
About Mercedes Sprinter 309 Cdi Mwb MOT Data
The Mercedes Sprinter 309 Cdi Mwb is a niche vehicle in the UK, with 1,205 MOT test results recorded in our database spanning 4 manufacture years. It has an overall MOT pass rate of 61.3% and a failure rate of 38.7%, which is around the UK average of approximately 37%.
For Mercedes Sprinter 309 Cdi Mwb 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 brakes 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 Sprinter 309 Cdi Mwb is likely to perform.
Lamps, Reflectors and Electrical Equipment — 37.6% of failures
Lamps, Reflectors and Electrical Equipment issues account for 37.6% of MOT failures on the Mercedes Sprinter 309 Cdi Mwb. 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.
Brakes — 35.9% of failures
Brakes issues account for 35.9% of MOT failures on the Mercedes Sprinter 309 Cdi Mwb. 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).
Suspension — 32.0% of failures
Suspension issues account for 32.0% of MOT failures on the Mercedes Sprinter 309 Cdi Mwb. 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.
Frequently Asked Questions
What is the MOT pass rate for the Mercedes Sprinter 309 Cdi Mwb?
Based on 1,205 MOT tests in our database, the Mercedes Sprinter 309 Cdi Mwb has an overall pass rate of 61.3% (38.7% fail rate).
What are the most common MOT failures on a Mercedes Sprinter 309 Cdi Mwb?
The top 3 reasons a Mercedes Sprinter 309 Cdi Mwb fails its MOT are: 1. Lamps, Reflectors and Electrical Equipment (37.6%), 2. Brakes (35.9%), 3. Suspension (32.0%). Check these areas before booking your MOT.
Is the Mercedes Sprinter 309 Cdi Mwb reliable?
With a 38.7% MOT failure rate, the Sprinter 309 Cdi Mwb is about average compared to the UK average of ~40%.
What should I check before an MOT on my Mercedes Sprinter 309 Cdi Mwb?
Based on failure data, focus on: Lamps, Reflectors and Electrical Equipment (37.6%); Brakes (35.9%); Suspension (32.0%). 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.