2011 Mitsubishi ASX 1.8L Diesel · WN11 GFY

A persistent and worsening pattern of structural and underbody corrosion dominates the mechanical history of this 2011 Mitsubishi ASX, with every MOT test since 2022 carrying advisories relating to corroded subframes, suspension arms, and inner sills. The 2026 test on 14 July passed, but it did so alongside notes recording very heavy corrosion on both front and rear subframes, heavy corrosion on all front and rear suspension arms, and corrosion to the rear towbar component. The 2025 test sequence is particularly telling: a fail on 15 July 2025 for an offside headlamp aim being too low was followed the same day by a pass at the same location, but both entries carried advisories for frayed offside front seat belt webbing, tyres worn down to 1.6mm, corroded rear brake pipes covered in grease or other material, and the same recurring subframe and suspension arm corrosion. The trajectory from 2022, when these components were first flagged as lightly corroded with structural rigidity not significantly reduced, to 2026, where the corrosion is described as very heavy, indicates a steady deterioration of the underbody rather than a stable condition. Against a fifteen-year lifespan and 98,905 recorded miles, the usage profile is broadly typical at roughly 6,594 miles annually, and there are no unusual gaps or sudden mileage jumps in the testing record. The MOT tests have been conducted annually without interruption since at least 2020, with no multi-year absences that might indicate long periods of standing. This consistent, average-rate usage means the corrosion pattern cannot be attributed to neglect through disuse; rather, it reflects the natural progression of road salt and moisture exposure on a vehicle of this age operating in typical UK conditions. The wear on consumables is consistent with this mileage, including the front tyres recorded at 1.6mm in 2025, which is at the legal limit. For a prospective buyer, the underbody corrosion is the primary concern and warrants a physical inspection on a ramp before purchase. The front and rear subframes, both sets of suspension arms, and the inner sills have all been flagged repeatedly, and the 2025 advisory specifically noted corroded rear brake pipes obscured by grease or other material, which is a known safety concern on older vehicles as brake line integrity can be compromised beneath surface coatings. On a test drive, listen for clonks or knocks from the suspension over uneven surfaces, as worn suspension arm bushes and corroded linkages often manifest as audible impacts and a vague, unsettled feel through the steering. Pay particular attention to any pulling to one side under braking, a soft or spongy brake pedal, or visible brake warning lights, as the obscured rear brake pipe condition makes it difficult to confirm full integrity without physical inspection of the lines. Additional checks should focus on the items raised in 2025 beyond the corrosion pattern. The offside front seat belt webbing was flagged as slightly damaged or frayed, and while this is a relatively minor advisory, any replacement should be confirmed as genuine and properly anchored. The front tyres were at 1.6mm in mid-2025 and will require replacement if not already done; inspect current tread depth and check for uneven shoulder wear, which can indicate suspension misalignment potentially linked to the corroded arm condition. Finally, the headlamp aim failure recorded in 2025 should be verified by checking that both dipped beam patterns are clearly defined against a flat wall, as persistent misalignment can suggest damaged adjusters or mounting points. Given the cumulative underbody advisories across five consecutive tests and the progression from light to very heavy corrosion, budgeting for structural remediation or careful monitoring should form part of any purchase decision.