Keep your engine from destroying itself with a misfire.

If the knock sensor in the engine detects pre-ignition, it will put the computer into limp mode in order to keep your engine from being damaged. Without the knock sensor, the engine can potentially damage itself, costing thousands of dollars in repairs.

Keep your engine together and from harming itself with a replacement knock sensor. If the knock sensor fails, it will put the car into limp mode as well by giving improper readings.