Maf Sensors Measure the amount of air flowing into a fuel injected engine. If you have a badly running engine and the engine check light reads P0101 then its likely time to replace your Mass Air Flow Sensor. Fit 98-00 Mercedes-Benz C43 AMG/05-06 Mercedes-Benz C55 AMG/00-06 Mercedes-Benz CL500/01-02 Mercedes-Benz CL55 AMG/01-02 Mercedes-Benz CL600 /99-03 Mercedes-Benz CLK430 /03-06 Mercedes-Benz CLK500/01-06 Mercedes-Benz CLK55 AMG/2006 Mercedes-Benz CLS500 /2004 Mercedes-Benz E320 /98-02 Mercedes-Benz E430/03-06 Mercedes-Benz E500/99-06 Mercedes-Benz E55 AMG /02-08 Mercedes-Benz G500/03-09 Mercedes-Benz G55 AMG/99-01 Mercedes-Benz ML430/02-07 Mercedes-Benz ML500 /00-03 Mercedes-Benz ML55 AMG/06-07 Mercedes-Benz R500/00-06 Mercedes-Benz S430/00-06 Mercedes-Benz S500/01-02 Mercedes-Benz S55 AMG/01-02 Mercedes-Benz S600/99-06 Mercedes-Benz SL500/05-10 Mercedes-Benz SLK55 AMG