2021 Mazda 3 2.0L Petrol · SP71 HTC

The most recent MOT test, conducted on 10 June 2026, resulted in a PASS with no defects or advisories recorded, which represents a positive immediate position for the vehicle. However, it is worth noting that this pass followed immediately after a failure on 8 June 2026, where the car was presented with a major defect concerning an offside front headlamp not operating on dipped beam, alongside three advisories relating to rear brake disc condition and front tyre wear. The earlier 2024 and 2025 tests also passed cleanly, save for an advisory on the rear brake disc noted in September 2025. While there is no pattern of escalating structural or mechanical failure, the recurrence of the rear brake disc advisory across two consecutive tests indicates an ongoing wear issue that has not yet reached the threshold for failure but warrants close attention. The recorded mileage of 22,552 miles across approximately five years equates to an annual average of around 4,510 miles, which is notably low for a vehicle of this age and suggests either predominantly light use or extended periods of standing. This usage profile has important mechanical implications. Low-mileage vehicles often accumulate wear unevenly; components such as brake discs and pads can suffer from surface corrosion and pitting due to infrequent use, tyres can develop sidewall perishing from age rather than tread wear, and rubber suspension bushes and seals can degrade through lack of regular flexing rather than mechanical fatigue. Coolant, brake fluid, and transmission fluid can also deteriorate on a calendar basis regardless of mileage, meaning time-scheduled servicing remains essential. Given the recurring advisory on the rear brake discs, a prospective buyer should physically inspect the discs for uneven wear, lipping at the outer edge, and any significant pitting or scoring that might compromise braking efficiency. On a test drive, listen for any brake shudder or pulsation through the pedal when applying the rear brakes, and observe whether the vehicle pulls to one side under braking. The offside front tyre cut and nearside front outer edge wear noted in 2026 should prompt a close inspection of the current tyres, checking for uneven tread wear across the axle, sufficient tread depth, and any signs of sidewall cracking or perishing consistent with age-related rubber degradation. The offside front headlamp failure that caused the earlier test to fail should also be verified as fully rectified by checking that both dipped beam headlamps illuminate correctly and that the lens units are free from moisture ingress or internal misting. Beyond the recorded items, the low annual mileage warrants broader condition checks typical of a lightly used but ageing vehicle. The 12V battery should be tested for state of health, as batteries degrade with time irrespective of use, and standing vehicles frequently suffer from insufficient charging cycles leading to premature failure. Inspect the undertray, which was noted as fitted in 2025, for evidence of fluid leaks or corrosion underneath, and verify that the service book contains consistent stamps confirming that time-based items such as brake fluid, coolant, and spark plugs or transmission oil, depending on the Mazda 3 specification, have been renewed at appropriate intervals. Examine the exhaust system for surface corrosion, particularly at joints and mounting points, and check all suspension components for binding, perished bushes, or seized calipers that may have developed through periods of inactivity. Finally, ensure that all warning lamps extinguish promptly after engine start and that the air conditioning system functions effectively, as low usage often leads to refrigerant seal degradation and reduced compressor performance.