2015 Infiniti Q50 2.1L Diesel · RK15 UBT

The 2015 INFINITI Q50 currently fails its MOT, recorded on 26 May 2026 at 148,993 miles. The test reveals a deteriorating maintenance trend, shifting from a clean pass in May 2024 to multiple critical failures within a single year. The tester flagged simultaneous electrical faults across the engine management, anti-lock braking, and electronic stability control systems, alongside a low coolant level and a seriously defective nearside front headlamp. Mechanical wear has also accelerated, with rear brake pads wearing thin and the nearside rear tyre falling below the 1.6mm legal limit. This cluster of failures indicates deferred servicing rather than isolated component fatigue. The vehicle requires immediate remedial work before it meets statutory roadworthiness standards. The recorded odometer progression demonstrates heavy, consistent use. The vehicle accumulated 19,657 miles between July 2022 and May 2023, followed by a further 24,496 miles by May 2024. This pace averages over 13,500 miles annually, placing significant strain on suspension geometry, braking systems, and drivetrain bearings. The gap between the May 2024 pass and the May 2026 failure covers 23,968 miles, a period where the owner allowed minor advisories to escalate into outright failures. The consistent high mileage explains the accelerated degradation of consumables, yet it also highlights a pattern of reactive rather than preventative upkeep. Previous custodians clearly prioritised operation over scheduled component replacement. A prospective buyer must prioritise a thorough underbody inspection, focusing on the front sub-frame corrosion flagged in the latest test. While the tester noted the rust has not yet seriously weakened the structure, unchecked progression will compromise chassis rigidity and mounting points for the steering and suspension. The recurring play in the rear anti-roll bar linkage ball joints across the 2025 and 2026 tests points to worn polyurethane or rubber bushings that require immediate replacement. Electrical diagnostics should target the ABS and ESC control modules, as simultaneous warning lamp illumination often traces back to a faulty wheel speed sensor or corroded wiring harness rather than isolated bulb failures. Verify the coolant system for leaks before committing to the purchase, as persistent low levels risk head gasket failure on this engine architecture.