2014 Mercedes-Benz B-Class 1.5L Diesel · LL14 YUX

A 2014 Mercedes-Benz B-Class showing five consecutive clean MOT passes with no advisories, failures, or recorded defects is an unusual mechanical profile for a vehicle now over a decade old and into six-figure mileage territory. The most recent test on 7 July 2026 returned a pass with no defects, continuing a pattern established since at least 2022. From a roadworthiness perspective, this suggests that the components typically scrutinised at annual inspection brake discs and pads, suspension arms and bushes, coil springs, exhaust integrity, steering and ball joints have remained within serviceable limits throughout this period. The absence of any advisories is particularly telling because items such as perished brake flexi hoses, cracked suspension bushes, or early exhaust corrosion on B-Class models of this generation would normally have surfaced as minor defects by this point in the vehicle's life. The clean record therefore indicates either meticulous pre-test preparation or a genuine absence of deterioration at the wear items inspected under DVSA criteria. At 110,487 miles across roughly 12 years, the vehicle has averaged approximately 9,200 miles annually, which is broadly consistent with typical mixed private and commuter use. There are no significant gaps in the MOT testing history, suggesting continuous road use rather than extended periods off the road, and no recorded mileage jumps between tests that would indicate a discrepancy or clock irregularity. Mechanically, this kind of steady, moderate usage tends to keep seals, gaskets, and rubber components active rather than allowing them to dry out from standing, while still representing enough accumulated mileage to mean that major service items such as timing chains, automatic transmission fluid, and suspension subframe mountings have all been exercised through their expected working life. The mileage is high enough that drivetrain wear should not be dismissed, but the absence of any drive-related advisories across five tests is a reassuring indicator that no significant leaks or component failures have yet been flagged. For a prospective buyer, the priority on inspection should be the items that the MOT record does not cover but are consistent with the mileage of this particular chassis. The Mercedes-Benz B-Class of this era is known for wear in the front lower control arm bushes, rear trailing arm bush deterioration, and play in the rear axle carrier bearings, none of which will always trigger an MOT failure but are worth probing on a road test. Listen for clonking or knocking over uneven surfaces, particularly from the rear, and feel for any vagueness or shimmy through the steering wheel that could indicate front suspension compliance beyond MOT tolerance. Inspect the rear subframe mounting points and brake line unions along the underbody for any bubbling corrosion, as this generation is not immune to surface rust in the wheel arches and undertray area, particularly given six-figure mileage exposure to winter road conditions. Under bonnet, the B-Class should be checked with the engine running from cold for any signs of timing chain rattle on initial start-up, which is a known concern on the higher-mileage M270 petrol units and older CDI diesels, and for any oil seepage from the balance shaft seal or rear main area. On the road, expect a smooth gearchange from the dual-clutch or torque converter automatic, with no harsh jerking under light throttle that would indicate mechatronic or torque converter wear. Brake feel should be firm and progressive without any pulling to one side or pedal judder under hard stopping, which would suggest warped front discs given the mileage. Finally, verify that the service history includes replacements of the automatic transmission fluid and filter at the manufacturer's recommended intervals, as this is critical to long-term gearbox durability on this platform and would not be evident from the MOT record alone.