2012 Mercedes-Benz B-Class 1.8L Diesel · FN12 LNU
2012 Mercedes-Benz B-Class (1.8L, diesel). First registered 12 Mar 2012. Recorded mileage 156,184 miles. MOT valid until 31 Mar 2027.
- Make & Model
- MERCEDES-BENZ B-CLASS
- Year / Origin
- 2012 · Nottingham
- Safety Recall
- Unknown
- MOT Status
- Valid until 31 Mar 2027
- Road Tax
- —
- Recorded Mileage
- 156,184 mi
- ULEZ Compliance
- Non-Compliant (Pre-Euro 6 Diesel)
- Fuel & Engine
- Diesel · 1.8L
- 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.
FN12 LNU Key Findings
- 5 MOT tests recorded
- Latest MOT passed on 02/04/2026
- 156,184 miles recorded at latest MOT
- 1 historical MOT failure
- 2 defects noted at the latest MOT
- Recurring brakes items (2 mentions)
Derived directly from the recorded DVSA and DVLA data shown on this page.
FN12 LNU 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 2012 Mercedes-Benz B-Class (FN12 LNU) between November 2022 and April 2026.
The record contains 4 passes and 1 failure.
The most recent test on 02 April 2026 was a pass, although the earlier record includes 1 failure that buyers may want to investigate.
Across all tests, the most frequently flagged areas are: Brakes (2 issues), Bodywork (2 issues). Repeated mentions in one area can indicate an ongoing pattern worth checking in person.
In total 3 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: “Offside Rear Brake pipe at imminent risk of failure or fracture (1.1.11 (a))”; “Nearside Rear Brake pipe at imminent risk of failure or fracture (1.1.11 (a))”; “Nearside Front Upper Anti-roll bar linkage ball joint dust cover no longer prevents the ingress of dirt (5.3.4 (b) (ii))”.
FN12 LNU Mileage History
- 25/11/2022147,312 mi
- 04/03/2024150,878 mi+3,566 mi
- 04/03/2024150,878 mi
- 17/03/2025153,893 mi+3,015 mi
- 02/04/2026156,184 mi+2,291 mi
Average of roughly 2,647 miles per year across 5 recorded odometer readings.
Technical Specifications
Core Specifications
Identification & Status
Dimensions & Weights
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Known faults for Mercedes-Benz Mercedes-Benz B-Class (W246)
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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MERCEDES-BENZ B-CLASS Model Intelligence & Reliability
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Historical MOT pass rates and DVLA records for 2012 model year cars.
- 7G-DCT Gearbox JudderModerate
The dual-clutch automatic can become hesitant or jerky if clutch wear is present or fluid changes have been skipped.
- OM651 Diesel Timing Chain Tensioner Oil LeakModerate
The gasket on the timing chain tensioner is a frequent leak point. Oil loss can reduce tensioner pressure and lead to chain rattle and eventual stretch.
- Water ingress in boot from rear air vent sealsModerate
The rear air vent seals behind the bumper can fail, allowing water into the boot. This can damage the rear SAM electrical module, causing lighting and locking faults.
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