The Bosch MERCEDES S550 W219 W221 MASS AIR FLOW SENSOR METER GL450 GL550 164 2730940948 is a genuine OEM part designed for optimal performance in your vehicle. All electronic items are tested before being listed.
If they do not function, then we do not list it. Parts come from the pacific northwest and have no fire damage or flood damage. WHAT YOU SEE IN THE PHOTOS IS WHAT YOU WILL RECEIVE. WE ONLY STOCK GENUINE HIGH QUALITY PARTS.