2003 Mazda MX-5 1.8L Petrol · OY03 XLM

A recurring theme of corrosion, tyre wear and emissions-related issues defines the mechanical story of this 23-year-old Mazda MX-5. The most recent test on 30 April 2025 recorded a pass, but it was accompanied by an exhaust gas leak, a minor insecure battery, an airbag warning lamp that fails to illuminate, and a parking brake that only just met the statutory efficiency threshold. Looking further back, the 2020 and 2021 tests show a cluster of advisories for nearside and offside front structural corrosion around the chassis skin above the anti-rollbar mounting, with the exhaust system suffering a major leak at the rear and a Lambda sensor reading outside limits in early 2020. Three failures between 2020 and 2022, including dangerously low rear tyre tread, a missing airbag, an inoperative horn and rear fog lamp, and the exhaust faults, indicate that this vehicle has not had an uninterrupted record of clean roadworthiness, and a buyer should weigh these recurring concerns alongside the more recent pass. Against an age of around 23 years, the recorded mileage of 120,460 equates to roughly 5,237 miles per year, which sits below typical accumulation for a vehicle of this era. The MOT records cover the period from early 2020 through to April 2025, with tests clustered in 2020, 2021 and 2022 and then a noticeable gap until the 2025 entry, suggesting periods of limited use interspersed with more active periods around the earlier test dates. Low annual mileage of this nature can mask deterioration in components that suffer from age-related degradation rather than wear, particularly rubber bushes, brake hydraulic seals, body seams and underbody corrosion, which is consistent with the structural advisories already recorded around the front chassis area. Conversely, lower running hours mean the brakes, clutch and engine internals may not have absorbed the typical wear expected at this odometer reading, though the binding rear brake and parking brake adjustment advisories hint that standing time may have introduced its own issues with seized caliper slide mechanisms or stretched cables. Prospective buyers should pay particular attention to the structural corrosion advisories, focusing the inspection on the front chassis rails and inner wings, especially the area above the anti-rollbar mountings on both sides, where any perforation, flaking or evidence of previous repair would warrant professional assessment. On a test drive, listen for clonks or knocks from the front suspension over bumps, feel for vagueness in steering response or tracking pull that could indicate worn anti-rollbar bushes or compromised mounting points, and check for uneven front tyre wear that could betray geometry issues stemming from the corroded structure. Inspect the exhaust system along its full length for soot traces, hangers and joint condition, since a fresh joint repair may have addressed the 2025 advisory leak, and verify that the Lambda sensor reading is within specification as the 2020 failure indicates prior emissions issues. With the engine running, watch for any excessive oil misting or drips given the persistent oil leak advisory, and inspect the underside and sump area for accumulation of grime and fresh residue. Given the airbag warning lamp advisory recorded at the 2025 test, confirm that the supplementary restraint system warning lamp now illuminates and extinguishes correctly on ignition, as a permanently extinguished lamp may indicate a fault within the airbag circuit that warrants diagnostic interrogation rather than a simple reset. For the parking brake and rear brake concerns, carry out a hill-start to verify the handbrake holds on an incline without excessive travel, and at low speed feel for any pulling or dragging from the rear, particularly the nearside, where a binding service brake was previously noted. Finally, with tyre wear advisories appearing across multiple tests including a dangerous failure for sub-1.6mm rear tread in 2022, examine all four tyres for age-cracking, uneven shoulder wear and current tread depth, and factor in the cost of a matching set given the MX-5's specific sizing requirements before committing to purchase.