2007 Mazda MX-5 1.8L Petrol · KT07 VSF

A pattern of corrosion sits at the centre of this MX-5's MOT record, and it is steadily intensifying. The most recent pass on 5 March 2026 carried advisories for an integral body structure corroded at the nearside rear inner sill, undersealing that is masking the underside, pitted and scored front and rear brake discs, and general suspension corrosion. The previous pass on 25 March 2025 reinforced the picture with advisory items for rear subframe and suspension component corrosion, under-body corrosion, and inner-face rear brake disc wear. Earlier tests had been largely clean, with two consecutive advisories-free passes in 2022 and 2023, but the intervening four years have introduced failures for both front coil springs fractured in May 2022 and a nearside front service brake excessively binding on 25 March 2025, alongside repeated advisories for the same nearside front brake binding recorded at the 2021 and 2024 tests. The trajectory is one of accumulating structural and component corrosion combined with braking and suspension wear becoming regular features of the annual inspection. With 52,448 miles recorded across nineteen years, the vehicle averages roughly 2,760 miles annually, which is markedly low for a roadster of this age. The MOT history shows continuous annual testing with no extended gaps, suggesting the car has remained in use rather than laid up, but the low annual accumulation means many components have seen limited working cycles. Brake discs and callipers, rubber boots, flexible hoses, and suspension bushes can deteriorate through age and environmental exposure regardless of mileage, and that dual mechanism of time-based degradation alongside modest use appears consistent with the corroded brake ferrules noted in 2022, the chronic nearside front brake binding advisories, the pitted discs flagged in 2025 and 2026, and the fractured coil springs that presented in 2022 despite relatively modest use. A prospective buyer should treat the corrosion trajectory as the primary inspection priority. The 2026 advisory noting that the nearside rear inner sill is corroded but structurally adequate means a close physical examination of both sills, the rear subframe mounting points, the boot floor, and the front suspension turrets is warranted, ideally with the car on a ramp to inspect areas hidden by the existing underseal. Probe any suspect panels for structural integrity and check that the underseal is not simply concealing advanced corrosion. The rear brake discs should be measured for remaining thickness and the inner faces inspected for lipping, while the front discs likewise need assessment for the pitting already flagged; budget for replacement of all four discs and pads if wear is advanced. On the test drive, listen for clonking or knocking from the front suspension over uneven surfaces, which could indicate worn bushes or top mount wear given the corrosion advisories on suspension components, and pay particular attention to the nearside front brake for any dragging sensation, uneven pulling, or a wheel that runs hotter than the opposite side, as the binding issue has been flagged three times across the record. Additional areas worth scrutinising include the nearside front brake calliper and slider mechanism, which may need refurbishment or replacement if binding recurs after the prior rectification, and the flexible brake hoses at all four corners, given the ferrule corrosion advisories recorded on the front pair and the rear nearside hose in 2022. With nineteen years of service, the tyres should be checked for age-related cracking regardless of tread depth, as the front pair were flagged for perishing in 2025, and the underside thoroughly inspected for fluid leaks from the rear subframe area and differential, particularly where corrosion could compromise mounting integrity. Finally, the fact that this vehicle has accrued corrosion across multiple structural zones despite its low annual mileage underscores that age, not distance, is the dominant wear factor here, and a mechanical inspection by a specialist familiar with MX-5 chassis corrosion patterns would be a prudent investment before purchase.