2009 Mazda 3 2.0L Petrol · BT09 LWW

A seventeen-year-old Mazda 3 with 137,613 miles carries a mixed MOT record that tells a story of chronic corrosion and accumulating wear on core underbody and braking components, rather than isolated problems. The most recent test on 2026-03-05 returned a clean pass with no advisories, but this follows immediately on from a Major defect failure just six days earlier on 2026-02-27 for a fractured offside front coil spring, alongside advisories covering rear subframe corrosion, rear suspension arm corrosion, and worn front brake discs. Looking further back, the 2025 cycle produced both a pass and a failure on the same day, the latter triggered by a Dangerous offside rear brake hose ferrule leak — a serious braking system defect. Across 2022 to 2024 the record is dotted with advisories for the rear subframe, suspension arm bushes, brake disc wear, and recurring tyre edge wear. Taken as a whole, the pattern is one of an ageing vehicle where structural corrosion and consumable wear have been steadily building, even though outright failures have been relatively few. Mileage accumulation on this Mazda sits at roughly 8,095 miles per year over its seventeen-year life, which is broadly typical for a car of its age and is consistent with regular commuter or family use rather than long-term lay-up. There are no extended gaps between tests that would suggest the vehicle was off the road for prolonged periods, and the testing history shows annual or near-annual MOT activity from 2021 through 2026. Mechanically, this level of sustained use means the engine, gearbox, and clutch have been worked consistently, while suspension, braking, and underbody components have been exposed to continuous road gritting and salt exposure. Combined with the age, this explains the recurring pattern of corrosion advisories on the rear subframe and suspension arms, as well as the brake hose and disc deterioration flagged in recent years. For a prospective buyer, the priority areas for physical inspection are the underbody, the front suspension, and the braking system. The fractured offside front coil spring recorded in February 2026 should have been replaced prior to the subsequent pass, and this needs verifying, as a broken spring on one side often masks or accelerates wear on the opposite side; on a test drive, listen for clonking or knocking over bumps and uneven road surfaces, and check that the vehicle sits level at the front when parked on flat ground. The repeated advisories for the rear subframe and rear suspension arm corrosion, dating back to 2022, suggest this is a progressive issue rather than a one-off surface blemish, so the subframe mounting points, suspension arm pick-ups, and any structural reinforcement areas should be examined closely for advanced rust, flaking, or perforation, particularly around jacking points and mounting brackets. The braking system also warrants close attention given the Dangerous brake hose ferrule leak in 2025 and the recurring front brake disc wear advisories. Both rear brake hoses and flexible lines throughout should be inspected for cracking, swelling, or corrosion at the ferrules where they meet the calipers and hard lines, and the front discs should be measured for remaining thickness and checked for lipping or heat scoring. On a road test, the pedal should feel firm and progressive with no sponginess, and the car should pull up straight without juddering under heavy braking. The pattern of tyres wearing close to the legal limit on both inner and outer edges, flagged multiple times between 2022 and 2025, points to possible alignment or suspension geometry wear, so a four-wheel alignment check and inspection of the front lower rear bushes previously flagged in 2022 would be advisable before purchase.