2021 Mercedes-Benz B 1.3L Petrol · WM21 ONT
2021 Mercedes-Benz B (1.3L, petrol). First registered 28 Jul 2021. Recorded mileage 51,042 miles. MOT valid until 21 May 2027. No outstanding manufacturer safety recalls recorded.
- Make & Model
- MERCEDES-BENZ B
- Year / Origin
- 2021 · Bristol
- Safety Recall
- None Outstanding
- MOT Status
- Valid until 21 May 2027
- Road Tax
- —
- Recorded Mileage
- 51,042 mi
- ULEZ Compliance
- ULEZ Compliant (Euro 4+)
- Fuel & Engine
- Petrol · 1.3L
- Reliability Guide
- Common Faults
Thinking of buying this vehicle? Free MOT and tax checks do not cover legal ownership. If outstanding finance exists, finance companies have legal right to repossess without compensation.
WM21 ONT Key Findings
- 5 MOT tests recorded
- Latest MOT passed on 21/05/2026
- 51,042 miles recorded at latest MOT
- 2 historical MOT failures
- No defects recorded at the latest MOT
- Recurring lighting items (2 mentions)
Derived directly from the recorded DVSA and DVLA data shown on this page.
WM21 ONT MOT History
Interpretation generated from the recorded test data above — not an official DVSA statement and not a substitute for an independent inspection.
5 MOT tests are recorded for this 2021 Mercedes-Benz B (WM21 ONT) between May 2024 and May 2026.
The record contains 3 passes and 2 failures.
The most recent test on 21 May 2026 was a pass, although the earlier record includes 2 failures that buyers may want to investigate.
Across all tests, the most frequently flagged areas are: Lighting (2 issues), Tyres (2 issues), Suspension (1 issue). Repeated mentions in one area can indicate an ongoing pattern worth checking in person.
In total 2 advisory notices are recorded. Advisories flag items that passed but may need attention before the next test; they are not evidence of how well the vehicle has been serviced.
Recorded failure items include: “Nearside Front Lower Suspension arm ball joint excessively worn (5.3.4 (a) (i))”.
WM21 ONT Mileage History
- 23/05/202427,756 mi
- 23/05/202427,756 mi
- 12/05/202539,026 mi+11,270 mi
- 21/05/202651,042 mi+12,016 mi
- 21/05/202651,042 mi
Average of roughly 11,682 miles per year across 5 recorded odometer readings.
Technical Specifications
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Known faults for Mercedes-Benz Mercedes-Benz B-Class (W247)
Our database tracks 3 specific mechanical faults and recurring failure patterns identified across UK MOT testing stations for this generation.
MOT Roadworthiness: Good
This rating reflects historical MOT pass rates and recurring advisory wear patterns from official DVSA test logs. Note that roadworthiness does not verify outstanding finance, insurance write-offs, or stolen records.
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Digital Service History
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Verified MOT failure trends, buying advice, and technical directory specifications.
Owner-reported defects, recurring MOT failure points, and estimated repair costs.
Browse production generations, registration statistics, and trim variants.
Historical MOT pass rates and DVLA records for 2021 model year cars.
- OM654d AdBlue dosing faults and no-restart countdownModerate
B 180d and B 200d cars use the OM654 2.0 diesel with an SCR system that Mercedes Club owners describe as fragile in UK winters: a failed pump, heater or NOx sensor triggers 'Check Service Now' plus an amber engine light, then a mileage countdown that ends with the engine refusing to restart. Carwow lists diesel stalling and reluctance to re-start among the recurring B-Class complaints. One member reported a failed AdBlue pump at 39,000 miles for around £300 fitted, and specialist garages warn the countdown cannot be reset by simply topping up the tank.
- Snapped coil springs and worn suspension joints at MOTModerate
DVSA MOT data analysed by Carpeep puts suspension as the second-largest failure category for the B-Class, at 22.4 per cent of all recorded failure items, with a fractured or broken coil spring the single most-common item at 6.8 per cent, followed by ball-joint dust covers no longer keeping dirt out (5.7 per cent) and split driveshaft gaiters (4.2 per cent). UK potholes plus the B-Class's tall, heavy nose accelerate the damage, and Carwow independently lists suspension problems among this car's recurring faults. Listen for knocks and check ride height on all four corners before viewing an older example.
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