DEF control module from a 2009 Mercedes-Benz GL320 Bluetec. This was carefully removed from a vehicle with fully functional diesel exhaust fluid system and is in good working order. The case has some minor external corrosion, but this will not affect its normal function. The connector has no broken parts or corrosion. The images are of the actual item you will receive. This item may require on-car programming, coding or flashing during installation in order to work with your vehicle. Please confirm that you or your repair facility can perform this procedure before making your purchase. Fits 2009-2012 Mercedes-Benz GL320/GL350 Bluetec, 2009-2012 Mercedes-Benz R320/R350 Bluetec, 2009-2011 Mercedes-Benz ML320/ML350 Bluetec and 2011-2012 Mercedes-Benz E350 Bluetec with diesel engine and part number 642 900 22 00 ONLY.