2004 Mazda MX-5 1.6L Petrol · AS02 MAZ

The latest MOT test result on 2025-09-16 indicates the vehicle passed with a single advisory requiring undersealing review, marking a return to a cleaner test outcome after several years of recurring advisories. While the overall maintenance trend appears stable rather than worsening, the persistent presence of structural and mechanical advisories—particularly those related to corrosion under the bodywork, suspension components, and brake systems—suggests that the vehicle has not received consistent attention to prevent progressive deterioration. The advisories from previous MOTs, such as the near-side front anti-lock braking system component damage, anti-roll bar linkage play, hydraulic leaks, and sub-frame corrosion, indicate a pattern of wear that has not been fully addressed, which could escalate into more serious issues if left unchecked. The recorded mileage of 64,667 miles for a vehicle aged approximately 22 years represents a relatively low annual usage rate of around 2,939 miles per year, which is unusually low for its age. Such low mileage often correlates with periods of long-term standing, particularly in a climate prone to corrosion, as the vehicle has likely been exposed to moisture without regular movement. This prolonged inactivity can accelerate corrosion beneath the bodywork, particularly in areas prone to water ingress like wheel arches, underseal zones, and sub-frames, which aligns with the repeated MOT advisories observed. Additionally, standing for extended periods can lead to brake system issues, such as corrosion in brake hoses and potential binding in calipers due to moisture absorption, further exacerbating wear patterns seen in the brake-related advisories. For a prospective buyer, the most critical areas to inspect are the structural integrity beneath the vehicle, as the recurring corrosion advisories suggest significant underseal failure. Visually check for rust progression along wheel arches, under the front and rear sub-frames, and beneath the body panels, particularly near wheel wells and exhaust systems. Listen for unusual suspension noises, such as clunks or rattles, when driving over bumps, which may indicate worn suspension bushes or anti-roll bar linkage play. The brake system should be thoroughly examined for signs of corrosion on brake hoses, particularly around the ferrule connections, and for uneven wear or binding on the discs, which could suggest caliper issues or moisture ingress. Test the ABS system by applying firm but controlled pressure on the brakes during cornering to ensure no spongy or erratic response, as the previous near-side front ABS component damage could be a recurring concern. Beyond the mechanical checks, the low annual mileage profile means the vehicle’s fluids may have degraded over time due to prolonged storage. Inspect the engine oil for signs of sludge or contamination, and replace it if necessary, as well as check the coolant system for any signs of degradation or leaks. The battery should be tested for voltage output and overall health, especially given the extended periods the vehicle has been stationary, as standing batteries can suffer from sulfation or corrosion. Tyres should be examined for sidewall perishing or cracking, which is more likely in a vehicle of this age and usage profile, and ensure the tread depth remains legal and uniform. Finally, verify that service records are up to date, particularly for oil changes and suspension servicing, to confirm that the vehicle has not been neglected despite its low mileage. If the undersealing is not addressed promptly, the risk of further corrosion and structural compromise will increase, making proactive undersealing and potential structural reinforcement essential.