The Bosch Knock Sensor - 0261231171 is a high-quality automotive sensor designed to detect engine knock or detonation, which can cause damage to the engine if not addressed. It is a vital component of the engine management system, providing real-time data to the engine control unit to adjust the ignition timing and prevent knock. This knock sensor is compatible with a wide range of vehicle makes and models, and it is made with durable materials to withstand the harsh conditions under the hood. It is a reliable and accurate sensor that helps ensure optimal engine performance and longevity.