2014 Mazda CX-5 2.0L Petrol · FN64 OPG

A clear pattern of progressive corrosion is emerging across this CX-5's rear suspension and underbody hardware, alongside a recent major structural failure that warrants close attention from any prospective buyer. The most recent assessment on 20 March 2026 returned a pass, but it was achieved only after a same-day re-test, and both entries carry the same set of advisories noting nearside and offside rear spring seat corrosion, an offside rear anti-roll bar linkage corroded but not seriously weakened, and product film on both front headlamp lenses reducing output. Earlier that same week on 19 March 2026 the vehicle failed, with the identical advisories carried forward, indicating that the underlying corrosion and lens degradation were already present and noted as defects requiring observation. More concerning is the prior year's outcome on 20 March 2025, where the vehicle failed on a Major defect for a fractured nearside rear coil spring, a serious structural and safety failure that could have caused a sudden loss of vehicle control had it progressed further before replacement. The recurrence of rear suspension advisories in the most recent test, combined with the prior fractured spring, suggests the rear axle area is undergoing meaningful structural deterioration rather than isolated wear. The recorded mileage of 80,050 miles across a twelve-year service life equates to an annual accumulation of roughly 6,670 miles, which is broadly typical for a vehicle of this age. There are no significant gaps in the MOT testing record, with annual tests consistently carried out from 2024 through 2026, suggesting the vehicle has remained in regular use rather than being laid up for extended periods. That said, the appearance of a fractured rear coil spring at this relatively modest mileage, alongside corrosion on the rear spring seats and anti-roll bar linkage, points to environmental exposure rather than high-mileage fatigue as the primary agent of wear. UK roads treated with winter salt, combined with the CX-5's relatively low ride height and exposed rear suspension geometry, are common contributors to this kind of progressive underbody corrosion, and the mileage alone should not reassure a buyer that the structural components are sound. For a test drive, particular attention should be paid to the rear suspension behaviour, as fractured or weakened coil springs and corroded anti-roll bar linkages produce distinctive symptoms that can be detected without specialist equipment. Listen for clonking or rattling noises from the rear axle over uneven surfaces, particularly when traversing speed bumps or potholes, which would suggest worn or loose link components. Feel for any wallowing or excessive rear body roll during cornering, indicating compromised anti-roll bar function, and pay attention to whether the vehicle sits level at the rear when parked on flat ground, as a fractured or sagging spring will often cause a visible height discrepancy between the nearside and offside. On start-up and low-speed manoeuvring, any vibrations or knocking through the steering could indicate wear related to the offside front inner CV joint boot, which was flagged as severely deteriorated and leaking grease in 2025 and may have worsened if not replaced. The vehicle should also be raised on a ramp if possible, allowing a thorough inspection of the rear spring seats, anti-roll bar linkages, and surrounding underbody for any perforation or advanced section loss beyond the advisory thresholds. The front headlamp lens degradation flagged in 2025 and again in 2026 should also be addressed, as the recurring advisory indicates the product film or oxidation has not been remedied and may now be borderline on seriously reducing light output, particularly given the cosmetic nature of the advisory wording. A practical check is to inspect both headlamps at night against a wall to confirm even beam pattern and adequate throw, as Mazda CX-5 headlamp units are known to haze significantly with age and heat cycling. Given the 2025 failure for a fractured coil spring, it is essential to verify documentary evidence that the spring was replaced with a quality component, and to confirm whether the same area has been re-inspected for adjacent weakness. The combination of a prior major structural failure, recurring rear suspension corrosion advisories, and a deteriorated CV boot suggests this vehicle would benefit from a pre-purchase inspection by a technician willing to place it on a lift, with particular focus on the rear axle, underbody integrity, and front driveline boots before commitment.