2004 Mazda MX-5 1.8L Petrol · FG04 WVW

A dominant theme across the MOT record is progressive corrosion of structural and suspension mounting points, which culminated in a full failure in July 2021 when both front anti‑roll‑bar brackets were judged seriously weakened and a rear seat‑belt anchorage was deemed unsafe. Subsequent passes have consistently carried advisories for under‑body corrosion on suspension components, corrosion‑related seat‑belt anchorage wear and a recurring oil‑leak flag, indicating that the rust issue has not been fully remedied. The latest test in June 2025 was passed, but the advisory for underside corrosion shows the problem persists, albeit without an immediate safety breach. At 142,642 mi the car averages roughly 6,500 mi per year, a mileage rate that sits squarely within normal use for a 22‑year‑old roadster. The MOT history shows no long gaps between examinations, suggesting the odometer reading is reliable and the vehicle has been driven regularly rather than stored for extended periods. This steady usage means consumable wear items such as brake pads, tyres and the engine oil system will have been exercised consistently, but also that any corrosion or leak present has had continual exposure to road grime and moisture, potentially accelerating degradation of affected components. Prospective buyers should give particular attention to the anti‑roll‑bar brackets and associated sub‑frame areas for signs of rust‑induced weakness – look for any flex or audible clunk when applying firm steering inputs or when the car is driven over bumps. The under‑body corrosion noted on suspension mounting points should be inspected for pitting or flaking that could compromise bushings or ball joints; any play in the front suspension or uneven tyre wear may be a symptom. The seat‑belt anchorage corrosion, flagged in both 2021 and 2020, warrants a visual check of the rear seat‑belt fittings for rust or compromised welds, as failure here would be a safety issue. The recurring oil‑leak advisory, though not classified as excessive, suggests a minor leak that should be located – a common source is the valve cover gasket or oil filter housing – and monitored for any increase that could affect engine oil level or cause smoke. Brake pads have been recorded as thin on several occasions, most recently in 2024, so the buyer should test the braking feel for any pedal fade, pulsation or increased stopping distances, and inspect the discs for scoring. Tyre tread depths on both front and rear wheels were noted as close to the legal limit in 2024, so a fresh measurement is essential; uneven wear could point to mis‑alignment or suspension issues already hinted at by the corrosion advisories. Finally, the faded front headlamps identified in 2024 should be examined for clarity and proper illumination, as reduced lighting can affect night‑time safety. Budgeting for corrosion remediation, a possible anti‑roll‑bar bracket replacement, seat‑belt anchorage repair, oil‑leak repair and tyre/ brake refurbishment will be prudent before committing to purchase.