2016 Mercedes-Benz Sprinter 2.1L Diesel · WN16 RHU

A pattern of recurring advisories and one major failure in late 2025 marks the defining mechanical story of this Sprinter. The most recent test on 10 October 2025 returned a pass, but only after a prior failure on 1 September 2025 for a torn nearside front inner constant velocity joint boot on the drive shaft, a component failure that allowed contamination ingress and warranted immediate rectification. Earlier in 2024, an advisory flagged corroded brake pipework concealed under grease or similar material, while both front shock absorbers were noted for excessive movement between the piston and casing, a defect severe enough that it was carried forward as an advisory across two consecutive tests in April 2024. Additionally, a 2024 failure for an ineffective fuel cap sealing device and an advisory regarding a cracked offside front headlight have all accumulated within a relatively short window, indicating that while the vehicle has remained roadworthy on test days, the underlying component condition has shown signs of cumulative wear. Recorded mileage of 137,229 miles over roughly a decade equates to approximately 13,700 miles annually, a figure well above average for a vehicle of this age and consistent with sustained commercial or heavy-duty use. Testing gaps are minimal, with annual MOT entries from 2021 onwards, suggesting the vehicle has remained in continuous service rather than off the road for extended periods. From a mechanical standpoint, this high-mileage profile accelerates wear on braking components, suspension bushes, drive shafts, and steering linkages, all areas that align with the advisories recorded. The CV joint boot failure and shock absorber movement particularly reflect the kind of fatigue expected on a heavily worked chassis, and the brake pipe corrosion advisory suggests the underbody is being exposed to conditions conducive to surface oxidation, likely road salt and grime accumulation. For a prospective buyer, the immediate priority is a thorough physical inspection of the constant velocity joint boots on both sides, including the offside inner joint, as a failure on one side at this mileage often foreshadows similar deterioration on the opposite side or on outer joints. Listen for clicking or knocking from the front axle during tight turning manoeuvres and watch for grease traces on the inner rim or suspension components. The shock absorber advisories should be verified by pushing down firmly on each front corner and releasing, noting any continued oscillation, clonking, or excessive travel, while also inspecting the front coil springs, top mounts, and lower suspension arms for cracking or play, as the Sprinter is known to suffer from worn radius arm bushes and anti-roll bar drop links at this mileage bracket. The brake pipe corrosion advisory warrants close scrutiny of the full underbody brake line routing, particularly along chassis rails and flexible sections near the front and rear axle, looking for flaking, pitting, or live rust that could compromise braking integrity. Pedal feel should be tested on the road for excessive sponginess or travel, which could indicate further deterioration beyond what was visible at the time of test. The reported headlamp lens defect and cracked headlight housing should prompt an examination for moisture ingress or condensation inside the lamp units, which can lead to electrical faults and reduced illumination. Finally, the fuel cap should be checked for proper sealing action and the threads inspected for wear, while a general inspection for oil leaks from the engine and gearbox sumps, given the high annual mileage, would be prudent to identify any developing concerns not yet captured in the MOT record.