This Genuine BMW Ignition Knock (Detonation) Sensor, part number 13627591662, is a high-quality replacement component for your vehicle's ignition system. It is designed to detect engine knock or detonation, which can cause damage to your engine if not addressed. The sensor is a crucial component in maintaining proper engine performance and fuel efficiency. It is an authentic BMW part, ensuring a perfect fit and reliable operation. This sensor is compatible with various BMW models and is an essential part of your vehicle's ignition system.