Engine Knock Sensor Assembly

Why You Need This Part

This critical device ensures your engine fires efficiently and safely. By monitoring vibrations caused by detonation ("knock"), it helps your ECU adjust the ignition timing to prevent damaging pre-ignition. Regular operation means improved performance, safety, and fuel economy.

How It Works

Installed on the engine block, this sensor converts vibrations into electrical signals delivered to the car’s computer. The ECU analyzes this data in real time to optimize combustion, protecting your engine from harmful knocking.

What Happens If It Breaks

When this sensor fails, your car’s computer can't detect engine knock. This leads to poor acceleration, decreased fuel efficiency, rough idling, and could result in severe engine damage if left unchecked. Your check engine light may also come on.

Compatibility

• Impreza
• Svx
• Legacy