Tensioner Unit – V Belt (Mercedes-Benz C-Class W202 / W203 / E-Class W210 / W211 / Viano/Vito W638) is a crucial component designed to maintain proper tension on the V-belt system in various Mercedes-Benz models. This unit helps ensure that the V-belt remains taut, enabling the reliable operation of engine-driven accessories such as the alternator, power steering pump, and air conditioning compressor.
This tensioner unit fits several Mercedes-Benz vehicles including C-Class W202 and W203, E-Class W210 and W211, as well as Viano and Vito models W638. When replacing your old tensioner, compare the shape, mounting points, and belt routing to confirm compatibility. The unit’s capability to maintain consistent belt tension directly affects accessory performance and belt longevity.
It’s important to inspect the current tensioner if you notice belt slippage, squealing noises, or uneven belt wear. This component is part of the V-belt category and carries the SKU BB-251864 for identification. If unsure about fitment or compatibility, consider submitting a request to the sales desk or using vehicle-specific tools to confirm the correct part.
- Maintains V-belt tension for Mercedes-Benz C-Class and E-Class models
- Compatible with Viano/Vito W638 series
- Essential for accessory drive system reliability
Need help matching this item to your vehicle? Use more V – Belt, Vehicle Parts Finder or Request a Part with your VIN, engine number, part number or clear photos.





