2003 Suzuki Grand Vitara 1.6L Petrol · KP03 KBU

Chronic underbody corrosion and exhaust gas leaks form the defining mechanical story of this 23-year-old Grand Vitara, a pattern that has intensified across the recorded MOT history. The most recent test on 13 April 2026 was a pass, but it carried a structural advisory noting corrosion across the under-chassis subframes and suspension, alongside two advisories for slight corrosion to the front brake hose ferrules, an exhaust gas leak, and a minor defect for a severely deteriorated offside front CV joint boot. The 2025 test repeated the same CV boot defect, the same exhaust leak, and added a rear structural corrosion advisory, indicating the underbody condition has spread rather than stabilised. Earlier tests show the corrosion and exhaust issues have been present since at least 2017, when a fuel pipe corrosion advisory and an oil leak were also flagged, and brake pipe corrosion appeared in 2022, meaning the braking and fuel systems have been progressively exposed to surface deterioration over many years. With 129,660 miles recorded across 23 years, the vehicle averages roughly 5,600 miles annually, which is low for its age and suggests extended periods of light use or standing rather than sustained driving. The gap between the 2020 test and the 2024 test, combined with consistently modest annual accumulation, points to a car that has not been heavily worked. Mechanically, lower mileage can preserve interior and drivetrain components but often accelerates corrosion on brake discs, brake pipes, exhaust joints, subframes, and underbody metal because short journeys do not allow components to dry and warm fully. The repeated rear structural advisories and brake pipe corrosion are consistent with this kind of low-use, exposure-heavy profile, and the front brake disc pitting recorded in 2024 reflects surface oxidation from infrequent rather than progressive wear. A prospective buyer should focus their physical inspection on the underbody, with particular attention to the front and rear subframes, suspension mounting points, and floor pans, as the structural advisories indicate corrosion is now widespread even though rigidity is not yet significantly reduced. Probe the brake pipes along their full length, especially at the rear where grease was previously applied, and examine the front brake hose ferrules for white or green verdigris and any weeping of fluid under pressure. On a test drive, listen for clonks or knocks from the front suspension over uneven surfaces, which could indicate worn bushes or corroded linkages, and feel for any brake pedal sponginess or pull to one side under firm braking, suggesting the corroded ferrules are restricting hose flexibility or the pitted discs are causing judder. Check the exhaust system for any audible ticking or blowing, particularly from the central section where leaks have been repeatedly noted, and inspect the offside front CV boot for torn rubber or fresh grease fling, as the same defect has now appeared on two consecutive tests. Lift the bonnet and look for signs of the previously flagged oil leak, checking the engine block, sump, and valve cover for wet residue or fresh staining on surrounding components. The fuel pipes noted as corroded in 2017 should be inspected closely for surface pitting and any seepage at joints. Given that the structural advisories have appeared in both 2025 and 2026 with no clear remediation between tests, a follow-up inspection on a ramp is strongly advisable to verify that corrosion remains cosmetic rather than load-bearing, particularly around the rear chassis rails where rigidity concerns were specifically raised.