Part number: MER-0021538428 is a new, unused Genuine Mercedes ignition knock (detonation) sensor. Knock Sensors tell your engine of any pre-detonation so that it can make the necessary adjustments to protect your engine from damage, thus they must be replaced if they no longer function properly.
Genuine Mercedes parts represent the best value in Mercedes parts. When you consider the quality, price, and lifetime that you get from the part you quickly realize there is no substitute for Genuine Mercedes engineering
FCP Euro carries a wide range of precision-manufactured OEM (original equipment manufacturer) and aftermarket replacement parts for your vehicle. It's almost certain we will be able to satisfy your auto parts needs, no matter how complicated. If you need an uncommon part that isn't currently in stock, we will try to find it for you.
FCP Euro offers free shipping over $49, a hassle free unlimited returns policy, lifetime warranty on all products they sell, and an in-house call center dedicated to helping customers with their repair and purchase needs.