2003 Mazda MX-5 1.8L Petrol · EP03 KNV

Severe structural corrosion is the primary mechanical risk for this vehicle, with the most recent MOT failure on 26 June 2026 highlighting significant degradation to the chassis and sills. The inspection recorded major failures due to the near-side rear inner and outer sills, as well as the near-side and off-side front main chassis members and anti-roll bar mounting areas, all being corroded to the extent that structural rigidity is significantly reduced. This represents a critical escalation from the 2025 advisory regarding sill corrosion and the 2022 advisory concerning front chassis rail corrosion, indicating a worsening trend in the vehicle's structural integrity. The recorded mileage of 107,226 miles over a 23-year period equates to an average annual accumulation of approximately 4,662 miles. While this is a low annual mileage for a vehicle of this age, the MOT history suggests that the lack of high-frequency usage has not prevented progressive oxidation of the metalwork. In vehicles with lower annual mileage, components such as suspension mounting points and sills can be susceptible to environmental corrosion if the vehicle is frequently parked in damp conditions or used for short trips that do not adequately clear moisture from the underside. A prospective buyer should focus heavily on the condition of the chassis and sills, as the 2026 failure points suggest the metal may be compromised beyond simple surface rust. During a test drive, pay close attention to the handling and stability of the car, particularly when cornering or encountering uneven surfaces, as compromised chassis members and anti-roll bar mountings can lead to unpredictable steering response or unusual creaking and knocking noises from the front suspension area. Any feeling of chassis flex or a lack of precision in the steering could be indicative of the structural issues flagged in the most recent test. In addition to the structural concerns, the vehicle has a history of electrical and consumable issues, including inoperative headlamps and registration plate lamps, as well as previous advisories for corroded coil springs and worn tyres. While the electrical failures recorded in June 2026 are specific to lighting, the recurring advisories for corrosion on suspension components like the near-side rear coil spring suggest that the entire underbody should be inspected for further degradation. Ensure that all lighting functions are fully operational and inspect the suspension for any signs of excessive play or noise that could stem from the previously noted corrosion on mounting areas.