What does a knock sensor do vauxhall zafira?

A knock sensor in a Vauxhall Zafira detects engine knocking or pinging, which indicates abnormal combustion that can lead to engine damage. It monitors vibrations caused by these knocks and sends signals to the engine control unit (ECU) to adjust the ignition timing and fuel mixture for optimal performance. By doing so, the knock sensor helps improve fuel efficiency and reduce emissions while protecting the engine from potential harm.