About Mass air flow A mass (air) flow sensor (MAF) is a sensor used to determine the mass flow rate of air entering a fuel-injected internal combustion engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine. Application: Compatible for Mercedes-BenzC-ClassCL203 [2001-2008] Coupe Compatible for Mercedes-BenzC-Class T-ModelS203 [2001-2007] Estate Compatible for Mercedes-BenzCLKC209 [2002-2009] Coupe Compatible for Mercedes-BenzCLKA209 [2003-2010] Convertible Compatible for Mercedes-BenzE-ClassW211 [2002-2008] Saloon Compatible for Mercedes-BenzE-Class T-ModelS211 [2003-2009] Estate Compatible for Mercedes-Benz SLK R171 [2004-2011] Convertible Replace Part Number： 5WK9638, 5WK9638Z, 2710940248, 271 094 02 48, A2710940248, A 271 094 02 48, 8ET009142-351 Specification Condition: Brand new Color: Black Warranty: one year warranty for any manufacturing defect Socket type: 5 pin Package Includes: 1pc as picture show Note: Please double confirm the part number and compatibility before ordering! Please contact us for whatever we can do for you!