2012 Mazda 3 1.6L Diesel · SY12 MJE

The 2012 Mazda 3 passed its most recent MOT on 2 October 2025 at 94,241 miles, but the maintenance trend is best described as stable with a slowly worsening underbody corrosion concern. The tester flagged the rear sub-frame as corroded but not seriously weakened in both the 2024 and 2025 tests, and rear suspension corrosion has appeared consistently since October 2023. These are not new failures, yet neither have they been rectified. Three advisories for tyres worn close to the legal limit or on the edge in October 2025 suggest consumable upkeep has been reactive rather than proactive. The vehicle remains roadworthy today, eight months after its last test, but the pattern indicates a car that has been driven and maintained to a passable minimum rather than a preventative standard. The mileage accumulation is broadly typical for a 14-year-old car. Recorded at 61,974 miles in October 2022, 77,400 miles in October 2023, 88,621 miles in September 2024, and 94,241 miles in October 2025, the annual distance has stepped up from roughly 15,400 miles between 2022 and 2023 to about 11,200 miles between 2023 and 2024 and 5,620 miles in the most recent twelve-month interval. That drop in the last year could reflect lighter use or a period of reduced driving. The record itself is reasonably complete with annual tests and no significant gaps, giving a reliable picture of the vehicle's recent use. A buyer should pay close attention to the rear sub-frame and rear suspension components during any physical inspection. The repeated advisory for rear sub-frame corrosion, paired with rear suspension corrosion flagged in three consecutive years from October 2023 onward, points to an underbody environment that has been steadily deteriorating. The tester's "not seriously weakened" wording in the 2025 pass is reassuring for now, but corrosion of this nature tends to accelerate, particularly on a 14-year-old vehicle that may have seen road salt exposure without adequate undersealing. Have a workshop put the car on a lift and probe the sub-frame mounting points, rear trailing arms, and spring seats for pitting or scaling. The tyre wear pattern also warrants scrutiny. Three separate advisories for tread worn close to the legal limit or on the edge in the October 2025 test, combined with the 2024 failure for simple lighting defects, suggest the previous owner addressed only what was strictly necessary to pass. Check whether the tyres have been replaced since October 2025 and inspect the inner edges of all four tyres for uneven wear that could indicate tracking or suspension geometry issues. Test all exterior lamps, including the registration plate and position lamps that failed in 2024, to confirm repairs have held. While the powertrain has generated no recorded defects, the absence of advisories for engine, gearbox, or clutch wear should not be mistaken for confirmation of condition; these components require a road test and cold start assessment.