1、Fitment: Glow plug control unit relay module is designed for X3 3 5 1 Series, excellent aftermarket replacement part to maintain reliable operation of your vehicle. 2、OE Numbers: Direct replacement for part numbers 12217801200 and 12217786821, suitable for DIY installation without the need for professional assistance. 3、Enhanced Ignition Support: Glow plug control module offers effective support to your vehicle's ignition system, helping to control the electrical supply to the glow plug for quick and efficient engine start up 4、Reliable and Durable: Designed with robust ABS materials, the glow plug relay module is made to withstand the harsh environmental changes, ensuring it operates correctly, providing you extended durability. 5、Perfect Fit Replacement Parts: Designed and manufactured according to original specifications, meeting or exceeding OEM standards to ensure appearance and function match the car.