2006 Mazda 6 2.0L Diesel · YX56 XGY

The most recent DVSA examination on 17 August 2026 resulted in a failure with five Major defects, all relating to excessive corrosion of the inner vehicle structure within 30 centimetres of body mounting points at the nearside and offside front wheel arches, the nearside front inner sill, the offside inner sill, and the offside rear inner sill. When viewed against the preceding history, the maintenance trajectory is clearly deteriorating rather than stable or improving. The 2023 test recorded corrosion as advisories, but by August 2025 the corrosion had progressed to Major failure items at multiple mounting points, the vehicle passed only because those items were not re-tested or were outside scope, and the latest 2026 test now shows a wider and more advanced distribution of structural corrosion. A single Major corrosion failure is a serious concern on a vehicle of this age, but five Major corrosion failures across both inner sills and both front wheel arches indicate that the chassis is no longer sound and that professional structural inspection or welding repair is unavoidable before the vehicle could lawfully return to the road. Recorded mileage stands at 146,496 miles on a 2006 Mazda 6, equating to approximately 7,325 miles per year across a twenty-year life, which is broadly typical for a car of this vintage and suggests neither prolonged standing nor particularly heavy use. That said, the MOT record itself shows intervals of around twelve months between tests with relatively modest annual mileages accumulated, and on a vehicle of this age the calendar-related degradation of consumables is often more relevant than the odometer reading. Standing periods encourage brake disc corrosion, caliper seizure, exhaust corrosion, and underfloor oxidation, all of which appear consistent with the corrosion pattern now being recorded on the chassis structure. For a prospective buyer, the immediate and overriding concern is the structural corrosion. Inner sill and wheel arch corrosion within thirty centimetres of body mounting points directly affects the rigidity of the body shell and the security of suspension, engine, and subframe mountings, so the vehicle would require a thorough inspection by a competent welder or bodyshop, ideally with the car placed on a ramp so that the full length of both inner sills, the front strut towers, the rear floor pans, and the jacking points can be examined for perforation. Any sense of sponginess when pressing on the sill, visible daylight through the metal, or bubbling under the paint should be treated as confirmation that the corrosion has already perforated. On a test drive, listen for clonks or knocks from the front suspension that could indicate weakened mounting points allowing component deflection, and pay attention to any steering vagueness or shudder that might suggest the front strut towers or subframe are no longer rigidly located. Beyond the structural issues, the previous advisories and failures also point to wear items that should be inspected before purchase. The 2024 failure for split suspension arm ball joint dust covers on both sides means the front lower wishbones are very likely due for renewal; perished gaiters allow water and grit into the ball joint, accelerating wear and producing clonks over bumps, imprecise steering, and uneven front tyre wear, particularly on the inner or outer shoulder. The recurring position lamp non-functionality failures suggest a habitual electrical issue, so all front side, tail, and number plate lamps should be checked for operation, and the bulb holders and wiring inspected for corrosion. Given the age and the corrosion findings, the brake discs and calipers should be examined for binding and surface corrosion, the exhaust system for blowing joints or perforation, the cooling system hoses for perishing, and the timing belt, if not replaced within the last five years or sixty thousand miles, should be considered due immediately. The tyres should be checked for sidewall cracking and perishing regardless of tread depth, and the twelve-volt battery load-tested, as a twenty-year-old vehicle standing for any period will almost certainly require a new battery. In summary, the corrosion pattern recorded at test is sufficiently severe and widespread that this vehicle would be difficult to recommend without substantial professional repair to the body structure, and any purchase decision should be made only after a full structural survey has confirmed the extent of the work required.