1997 Mazda Bongo 2.5L Diesel · P850 CFH

A persistent pattern of corrosion across the bodywork and suspension mounting areas dominates the MOT history of this 1997 Mazda Bongo, signalling a vehicle that is structurally ageing beyond what its passing test results might superficially suggest. The most recent test on 8 January 2026 recorded a pass, but only two days earlier the vehicle had failed and been re-presented, with the same set of advisories carried forward. Across every test since 2023, the nearside rear suspension component mounting area has been flagged for corrosion, and by 2025 the offside front suspension arm itself was noted as corroded though not seriously weakened, alongside offside rear suspension mounting corrosion. Body integrity advisories have compounded year on year, with the nearside rear outer sill holed in 2023, the offside inner sill holed in 2025, and both rear arches holed by 2025 and 2026, though none of these perforations sit within the strict prescribed areas that would mandate failure. The 2026 record also introduces a more concerning entry noting corrosion within the integral body structure itself, albeit still assessed as not significantly reducing structural rigidity. The cumulative trend is one of steady deterioration rather than stabilisation, and a prospective buyer should treat the corrosion picture as the defining mechanical risk. The recorded mileage of 208,601 miles over roughly 29 years equates to approximately 7,193 miles annually, which sits broadly in line with typical usage for a working commercial van of this era and rules out either extended periods of standing or exceptionally heavy commercial duty. The annual accumulation appears consistent across the testing history, with no anomalous spikes or long unaccounted gaps between tests, suggesting the vehicle has remained in regular use throughout its life. Mechanical implications of this mileage band are predictable for a high-mileage Mazda diesel of this generation: the engine, transmission and drivetrain will have accumulated substantial internal wear, and consumable items such as clutch, turbocharger, injector seals and cooling system components will be approaching or past their expected service life. The recurring advisory for excessive exhaust smoke noted on both the failed and passed tests in January 2026 is consistent with a diesel engine of this age and mileage developing worn piston rings, turbo seal degradation, or injector issues allowing oil into the combustion chamber. The brake system warrants particular scrutiny on a physical inspection. Fluctuating front brake performance was flagged in both 2023 and 2026, while nearside front and rear brake binding advisories appeared in 2023, alongside a nearside rear parking brake imbalance suggesting the rear drum or caliper mechanism is not returning fully or is unevenly adjusted. Binding calipers on a Bongo of this age frequently indicate seized slider pins or corroded handbrake mechanisms within the rear drums, and these conditions can produce pulling to one side under braking, a hot wheel after driving, or a handbrake that fails to hold on an incline. A test drive should include several firm stops from speed to check for pedal judder, which on older Japanese commercial vehicles often points to warped front discs rather than pad wear alone, and a slow-speed manoeuvring check to feel whether the nearside rear drags or the vehicle pulls noticeably. Suspension and underbody inspection should be prioritised given the chronic mounting area corrosion advisories. The nearside rear and offside rear suspension mountings have been flagged for three consecutive years, and while still considered not excessive, this corrosion progresses and is likely now at or approaching the threshold. With the vehicle raised, a buyer should look closely at the rear spring seats, trailing arm bushes and shock absorber top mounts for any flaking that has advanced beyond surface rust, and listen for clonks or knocking over speed bumps and uneven road surfaces which would indicate compromised bushes. The exhaust system warrants a physical check for the minor leak noted in 2024 and the smoke concern raised in 2026, with particular attention to the manifold gasket and turbo-to-downpipe joint, as oil misting around the turbo or a blue haze on startup would corroborate the emissions advisory. Finally, the underside should be examined for fresh oil residue consistent with the 2024 advisory, paying specific attention to the sump, cam seals and rear main oil seal area, as a high-mileage diesel of this vintage commonly weeps from these points when engine wear accelerates.