Feature●[PREMIUM PERFORMANCE] - Bosch Knock Sensors are highly accurate and sensitive for superior engine knock detection, ensuring efficient performance and long life for your vehicle●[ACTUAL OE] - Bosch Original Equipment Knock Sensors arent just a a quality replacement component, theyre the same sensor your vehicle was equipped with when manufactured - minus the expense of brand name packaging●[SUPERIOR ENGINEERING] - Robust design features a linear signal over a large frequency range, improved efficiency and prolonged engine life, and a wide temperature range that withstands extreme hot and cold operating conditions●[LONGER LIFE] - Bosch Knock Sensors deliver the precision operation and long service life your vehicle needs for superior performance while preserving engine longevity●Replaces OE numbers 12141720517, 91160614100●For select 1987-90 Porsche 928 vehicles (verify specific fitment details with fit checker above)Description Bosch Original Equipment Camshaft Position Sensors determine engine position based on the location of the camshaft - engine position is used for determining fuel injection and ignition sequence. Bosch Original Equipment Camshaft Position Sensors arent just a quality replacement component, theyre the same sensor your vehicle was equipped with when manufactured - minus the expense of brand name packaging. Robust design features twist insensitive mounting (TIM) for ease of installation, reliable digital measurement, and a wide temperature range that withstands extreme hot and cold operating conditions. Bosch Camshaft Position Sensors deliver the precision operation and long service life your vehicle needs for superior performance, lowest emissions, and optimum fuel mileage.