What causes a knock sensor code in a 2002 Nissan Quest?

A knock sensor code in a 2002 Nissan Quest can be triggered by several factors, such as a faulty knock sensor, wiring issues, or poor connections. Engine knocking or pinging due to incorrect timing, low octane fuel, or carbon buildup can also contribute to the code being set. Additionally, problems with the engine's air-fuel mixture or ignition system may lead to false readings. Proper diagnostics are essential to pinpoint the exact cause.