A knock sensor works hand in hand with the vehicles ignition timing to help detect pinging in the engine. This is linked to your vehicles ECU, or on board computer. In simple terms the knock sensor senses knocking in the engine. A failing knock sensor, can cause the engine to run unhealthily and in many cases not run at all. At Aceparts.co.uk we stock a wide range of quality knock sensors for all types of cars and vans, so we're 99.9% sure we will have the knock sensor you require. Be sure to order online with Aceparts for a hassle free, money saving experience.