2003 Ford Fusion 1.6L Petrol · KD03 ACU

A recurring corrosion issue affecting both rear coil springs has been flagged at every single MOT since at least 2024, with identical advisories appearing on the 2026-02-26 pass, the 2025-02-26 pass, the 2024-02-27 pass, and even on the 2024-02-26 fail, indicating a chronic and unresolved deterioration of the rear suspension rather than a one-off observation. Despite this persistent pattern, the vehicle has continued to pass each annual test, which suggests the corrosion remains within advisory thresholds for now but is clearly worsening year on year and will eventually progress into a fail category. The 2024-02-26 test did produce a Major defect for an offside front suspension arm ball joint dust cover failing to prevent dirt ingress, alongside a nail-in-tyre advisory, both of which were remedied before the re-test the following day. Separately, a minor oil leak was noted back in 2023, and while it was deemed not excessive at that time, oil leaks on older vehicles have a habit of migrating or worsening over successive years and warrant close physical inspection. With 82,656 miles accumulated over roughly 23 years, this Ford Fusion has averaged only around 3,594 miles annually, which is exceptionally low for its age and points to either prolonged periods of inactivity or genuinely light usage. The mileage consistency between the 2024, 2025, and 2026 tests shows only modest accumulation of a few thousand miles per year, reinforcing the impression of a low-use vehicle. Mechanically, such low mileage can be a double-edged sword; while the engine, transmission, and drivetrain have experienced less wear than a higher-mileage counterpart, prolonged standing can accelerate corrosion on exposed metal components, degrade rubber seals and bushes through lack of regular flexing, and encourage oil seals to weep once the vehicle is run intermittently rather than continuously. The chronic rear coil spring corrosion is consistent with this pattern, as springs are constantly exposed to road moisture and salt, and benefit little from low annual mileage in terms of rust prevention. For a prospective buyer, the priority inspection area is unquestionably the rear suspension, specifically both coil springs, where the three-year run of identical advisories signals that surface corrosion is now entrenched and will likely require replacement within the next one to two test cycles. On a test drive, listen for any clonking or rattling noises from the rear over uneven surfaces, as corroded springs can fracture and cause sudden audible thuds, and pay particular attention to whether the vehicle sits level or shows any sagging at the rear. Inspect the springs visually through the wheel arches for deep pitting, flaking, or any visible cracks in the coils, as MOT advisories for corrosion can rapidly escalate to Major defects once structural integrity is compromised. Beyond the rear springs, the front suspension should be examined for any play in the offside track control arm ball joint, particularly given the 2024 dust cover failure; jack the front offside wheel and check for vertical or horizontal looseness in the joint, and listen for knocking on turn-in or over speed humps. Finally, check the underside and engine bay for any signs of fresh oil residue around the sump, cam cover, or rocker gasket, given the 2023 oil leak advisory, and verify the coolant and fluid levels are topped up, as a low-use older vehicle can suffer seal dehydration that only manifests after regular driving resumes.