Mercedes Benz Citan 109 Pure Cdi MOT Failures
An analysis of 12,491 real DVSA MOT tests on the Mercedes Benz Citan 109 Pure Cdi — what fails, how often, and how that compares to every other car on UK roads.
Where the Mercedes Benz Citan 109 Pure Cdi fails its MOT
The single biggest MOT failure point on the Mercedes Benz Citan 109 Pure Cdi is emissions failure — this model is 8.1 times more likely to fail on this item than the average car on UK roads. That makes it worth watching for anyone buying or owning this model. Across 12,491 MOT tests, 1.31% of all Mercedes Benz Citan 109 Pure Cdi tests recorded this as a failure.
Exhaust and emissions failures often point to catalytic converter degradation, lambda sensor faults, or — in diesel models — DPF problems. These can be expensive to fix and will cause an immediate MOT failure.
Other notable weak points include stop lamp missing, inoperative or in the case o... (44x the fleet average), rear registration plate lamp or light source mi... (12x the fleet average), brake pedal anti-slip provision missing, loose ... (26x the fleet average), and wheel badly distorted or wear between wheel and... (5.5x the fleet average). These ratios compare the Mercedes Benz Citan 109 Pure Cdi's failure rate on each item against the national average for all cars tested — a ratio of 10x means this model fails ten times more often than a typical car.
The failures span 4 categories: Exhaust & Emissions, Lights & Electrics, Brakes, Wheels. If you're inspecting a Mercedes Benz Citan 109 Pure Cdi before purchase, these are the areas to focus on — and if any have been flagged as advisories on a previous MOT, they're likely to become failures in the near future.
How failures change with mileage
The Mercedes Benz Citan 109 Pure Cdi's weak points shift as the car covers more miles. Understanding these patterns helps you know what to expect — and what to budget for — at each stage of ownership.
Under 60,000 miles
At this mileage, most failures are either design-related or caused by age rather than wear. Components like bushes and drop links may not have been replaced yet, and original-fit parts can deteriorate even on low-mileage cars that spend a lot of time sitting.
For the Mercedes Benz Citan 109 Pure Cdi specifically, the DVSA data shows the most common failures at this mileage are stop lamp missing, inoperative or in the case o... (44x the average) and brake pedal anti-slip provision missing, loose ... (26x). rear registration plate lamp or light source mi... (12x) and emissions failure (7.2x) also appear frequently.
60,000 to 100,000 miles
This is where routine wear items start to show up. Brake components, tyres, and exhaust parts have done serious work by this point. Cars that have been well serviced will show fewer of these failures — this mileage band is where good maintenance really separates the well-kept from the neglected.
For the Mercedes Benz Citan 109 Pure Cdi specifically, the DVSA data shows the most common failures at this mileage are brake pedal anti-slip provision missing, loose ... (14x the average) and stop lamp missing, inoperative or in the case o... (11x). emissions failure (7.0x) and rear registration plate lamp or light source mi... (6.4x) also appear frequently.
The shift from stop lamp missing, inoperative or in the case o... at lower mileages to brake pedal anti-slip provision missing, loose ... at higher mileages is typical — early failures tend to be design or factory-related, while high-mileage failures reflect accumulated mechanical wear. A car that's been well maintained will usually dodge the worst of both.
What to check before buying a Mercedes Benz Citan 109 Pure Cdi
Based on the MOT failure data and known issues above, here's what to prioritise when inspecting a Mercedes Benz Citan 109 Pure Cdi:
Exhaust & Emissions — check for emissions failure. Lights & Electrics — check for stop lamp missing, inoperative or in the case o..., rear registration plate lamp or light source mi.... Brakes — check for brake pedal anti-slip provision missing, loose ....
Always check the car's full MOT history for patterns — recurring advisories often become failures within 12 months. Enter any reg into our free car check to see the complete picture.
Looking at a specific Mercedes Benz Citan 109 Pure Cdi?
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Mercedes Benz Citan 109 Pure Cdi MOT FAQs
What are the most common MOT failures on a Mercedes Benz Citan 109 Pure Cdi?
Based on 12,491 DVSA MOT tests, the most common failure is emissions failure — at 8x the national fleet average. Other frequent failures include stop lamp missing, inoperative or in the case o... and rear registration plate lamp or light source mi....
Is the Mercedes Benz Citan 109 Pure Cdi reliable based on MOT data?
The Mercedes Benz Citan 109 Pure Cdi has 5 categories where it fails more often than average. The main concern is emissions failure. Always check a specific car's full history before buying.
What MOT failures should I expect at high mileage?
The most common high-mileage failures include emissions failure, stop lamp missing, inoperative or in the case o..., rear registration plate lamp or light source mi....
How do I check a Mercedes Benz Citan 109 Pure Cdi's MOT history?
Enter the registration number into our free car check above. You'll see every MOT test result, advisories and failures, mileage readings, write-off status, and finance checks.
MOT failure data sourced from DVSA bulk test records via data.gov.uk. Ratios compare this model's failure rate against the national fleet average. Known issues sourced from manufacturer bulletins, specialist workshops, and verified owner reports.