A6540940004 Air Filter fit For CLS C257 E-CLASS W213 S-CLASS W222 V222 X222 2017-. OEM NO. : A6540940004. Protects the air conditioner: The filter protects your car's air，conditioning system from dust and dirt, helping it to stay cleaner. Easy Installation: Simple fit-and-forget design Durable Material: Long-lasting carbon filter Double-layer activated carbon filter cloth unwanted cabin smells Filters 99% of dust and allergens, Manufacturer: Onve Equipment