This Engine Crankshaft Position Sensor-Crank Angle Sensor is a must-have for Audi S4 owners. It accurately detects the position of the engine's crankshaft to ensure proper ignition timing and fuel injection. This high-quality sensor is manufactured by Bosch, a brand known for its reliability and durability. With interchange part number 077905381F and manufacturer part number 0261210190, this sensor is specifically designed for 04-09 S4 4.2L-V8 models. It is a crucial part for maintaining the performance and efficiency of your Audi S4. Get yours today and enjoy a smooth driving experience.