1、OE Number: The referencing OE number of this glow plug system control unit are 6461532579, A6461532579, molded and designed depend on the original data. 2、Fitment: The glow plug relay control unit is a replacement for Benz C‑CLASS W204, for C‑CLASS T‑Model S204, for E‑CLASS W211, for E‑CLASS T‑Model. 3、Easier Starting: Increasing the intake port temperature in low temperature environments and increasing the fuel ignition temperature, making it easier for the car to start. 4、Energy Efficiency: The control unit can adjust the preheating current according to the temperature and engine needs, which can better protect the battery and extend the battery life. 5、Durability: Made of quality materials, reliable quality, with strong durability, able to operate well in a variety of working environments.