2004 Mercedes-Benz Viano 2.1L Diesel · AF04 GGP

The most recent DVSA examination on 17 June 2025 resulted in a Pass, although the record carries three advisories which merit close scrutiny by any prospective purchaser. The trend over the past four years is one of progressive rather than stable deterioration: the 2023 test recorded brake imbalance and corroded rear arches concealed by silver tape, the 2022 test resulted in a Fail for an inoperative number plate lamp and a windscreen crack obstructing the driver’s view, and the 2021 test produced a Fail with three Major defects relating to excessively corroded suspension mounting points at both front and rear inner and outer sills. While the vehicle is presently legal, the recurring advisories for corrosion to inner sills, box sections, outer sills, rear arches, and underbody repairs heavily under-sealed suggest an ongoing structural condition that has not been resolved and which will inevitably progress. The advisory for all four tyres being worn close to the legal limit or worn on edge additionally indicates that replacement has been deferred and uneven wear geometry may exist. With 312,368 miles recorded over an approximate 22 year life, this Viano is averaging around 14,199 miles annually, which is high for a passenger-derived van of this age and points to sustained commercial or heavy family use rather than gentle private motoring. Such sustained accumulation accelerates wear on every consumable and major drivetrain component, particularly clutches, automatic transmission torque converters, dual mass flywheels, injectors, turbochargers, engine mounts, and suspension bushes. The fact that mileage has been added consistently each year suggests the vehicle has remained in regular service rather than standing for prolonged periods, which is mechanically favourable for avoiding seized calipers, perished rubber, and flat-spotted tyres, but unfavourable for long-term component fatigue. Given the recurring corrosion advisories, a thorough physical inspection is essential before purchase. The vehicle should be raised on a ramp or examined with a torch beneath to verify whether the heavy corrosion to inner sills and box sections, the under-sealed repairs, and the rear arch corrosion hidden by silver tape are cosmetic surface oxidation or structurally compromising perforation. A magnet should be used to test for filler, and particular attention paid to suspension mounting points on both inner and outer sills, which were flagged as excessively corroded in 2021. A test drive should focus on listening for suspension clonks or knocks over uneven surfaces, feeling for pulling or instability under braking, and checking for any travel or inconsistency in the parking brake application, which was noted as uneven in 2023. The brake pedal should be firm and progressive, and the vehicle should track straight without vibration through the steering wheel, given the previous advisory for imbalanced front braking. Beyond the documented advisories, this mileage and age warrant checks of time-served items regardless of MOT outcome. The timing chain and associated tensioners on the M-class diesel engines used in this era are known to stretch at high mileage, so any rattle on cold start should be investigated immediately. Brake discs should be inspected for lipping and hot spots, the 12V battery load tested, and all fluids examined for condition and age; coolant, brake fluid, power steering fluid, and automatic transmission fluid should ideally have been renewed within the last two to three years. The exhaust system should be checked for the broken front mount flagged in 2022, and the underside inspected for the noted oil leak, ensuring it has not worsened. Finally, headlamp lens condition should be assessed, as discolouration has been flagged repeatedly since 2022, and all tyres should be examined for age-related perishing on the sidewalls even if the tread depth is currently acceptable, particularly given the advisory for edge wear on all four corners which may indicate misalignment or worn suspension bushes requiring replacement.