Engine Throttle Valve Body 13541503358 1503358 68257 For BMW 1 3 5 X Z Series 1. Product Introduction & Purpose This is an Electronic Throttle Body (ETB) designed for various BMW gasoline engine models. It replaces traditional cable throttles and is directly controlled by the engine computer (DME). As a core component of the engine's air intake system, it precisely regulates the volume of air entering the engine, directly impacting power output, fuel economy, and emissions. 2