MOT failure data · 2025
Mercedes-Benz Viano MOT problems
Across every Mercedes-Benz Viano that failed its 2025 MOT, the defect testers recorded most often was rbt (sp) efficiency below requirements, on 4.22% of failure items. The broadest problem area was lamps, reflectors and electrical equipment at 24.97%. These are recorded defects across the model, not a diagnosis of any one car.
Most common Mercedes-Benz Viano MOT failures
| # | Recorded defect | Area | Share |
|---|---|---|---|
| 1 | Rbt (sp) efficiency below requirements | Brakes | 4.22% |
| 2 | Side repeaters not working | Lamps, reflectors and electrical equipment | 3.81% |
| 3 | Tread depth tread depth below requirements of 1.6mm | Tyres | 3.22% |
| 4 | Position lamp not working | Lamps, reflectors and electrical equipment | 3.12% |
| 5 | Rbt (sp) efficiency less than 50% of the required value | Brakes | 2.91% |
| 6 | SRS malfunction indicator lamp warning lamp indicates a fault | Seat belts and supplementary restraint systems | 2.64% |
| 7 | Condition has ply or cords exposed | Tyres | 2.57% |
| 8 | Ball joint ball joint excessively worn | Suspension | 2.57% |
| 9 | Linkage ball joint dust cover ball joint dust cover no longer prevents the ingress of dirt | Suspension | 2.41% |
| 10 | Malfunction indicator lamp inoperative or indicates a malfunction | Noise, emissions and leaks | 2.17% |
Shares are of all recorded failure items for this model, so they sum to less than 100% — a single failed test often records several defects, and the long tail below the top 10 is not shown.
What this means if you are buying one
Use it as a viewing checklist. If you are looking at a Mercedes-Benz Viano, these are the areas worth inspecting and worth asking about — and worth reading the car's own MOT history for, since a defect that keeps reappearing as an advisory is a better signal than any model-wide average.
The MOT record also has hard limits: it does not check the engine, clutch or gearbox, and it says nothing about outstanding finance, insurance write-off history, stolen markers or whether the mileage is genuine. Our used Mercedes-Benz Viano buying guide covers what to check beyond the MOT.
Checking a specific Mercedes-Benz Viano?
Enter its registration for finance, write-off, stolen, mileage and keeper history.
Other Mercedes-Benz models
- Mercedes-Benz A-Class MOT problems
- Mercedes-Benz GLA MOT problems
- Mercedes-Benz Vito MOT problems
- Mercedes-Benz GLC MOT problems
- Mercedes-Benz CLA MOT problems
- Mercedes-Benz B-Class MOT problems
Mercedes-Benz Viano MOT FAQs
What does a Mercedes-Benz Viano most commonly fail its MOT on?
The single most recorded defect on Mercedes-Benz Viano cars failing their 2025 MOT was "rbt (sp) efficiency below requirements", appearing on 4.22% of failure items.
Does this mean my Mercedes-Benz Viano will fail?
No. This is what testers recorded across every Mercedes-Benz Viano that failed in 2025. It shows where this model tends to need attention, not the condition of any individual car. The Mercedes-Benz Viano passed 72.68% of its initial tests.
How do I see a specific Mercedes-Benz Viano's MOT history?
Enter its registration on our free MOT history check to see that car's own test results, advisories and recorded mileages.
See also: Mercedes-Benz Viano MOT pass rate · used Mercedes-Benz Viano buying guide · free MOT history check
Defect counts from the DVSA MOT Anonymised test-item data for 2025 (class 4 initial tests, failure items only — advisories and minor defects excluded), licensed under the Open Government Licence v3.0.