This TOPRAN glow plug control unit, part number 115 859, is designed to manage the activation and deactivation of your vehicle's glow plugs. Proper functioning of this unit is crucial for ensuring efficient cold starts, especially in lower temperatures. Engineered to meet specific vehicle requirements, this control unit integrates seamlessly with your existing electrical system. It plays a vital role in the combustion process by preheating the cylinders, allowing for smoother engine ignition and reduced emissions during startup. Replacing a faulty glow plug control unit can resolve issues such as hard starting, rough idling after startup, or engine warning lights related to the glow plug system. Trust TOPRAN for dependable performance and a precise fit.