It basically listens for pre – ignition, or “knock” – that’s an uncontrolled explosion in the cylinder before the spark plug fires at the right time. It’s a little microphone, really, that picks up those vibrations. It sends a signal to the engine control unit—the computer—telling it what’s going on inside the engine. It doesn’t fix the knock, it just reports it. Think of it as an early warning system. The engine computer uses the information from the knock sensor to adjust the ignition timing. If it detects knock, it retards the timing – delays the spark – to protect the engine. It’s part of a feedback loop; it’s constantly working with the computer to keep things running smoothly and efficiently. It helps prevent damage from detonation, which can really hurt an engine over time. Without a functioning knock sensor, the engine could experience serious internal damage. Detonation is like little hammers banging away inside the cylinders. You’ll notice if it’s gone bad because you might get a check engine light, and you could experience a loss of power or even rough running. Ignoring it can lead to expensive repairs down the road – things like piston damage or even a completely failed engine. They're fairly affordable to replace, and you can find them easily enough. A site like Fixparts Online has a good selection if you’re looking to do the job yourself. It's a small part that acts like a shield for a really expensive component – your engine. Year-round reliability: Knock Sensor (MPN 0261231183) includes a 12-month warranty!

About Bosch

Robert Bosch GmbH is a global leader in automotive technology, offering high-quality parts and systems that enhance vehicle efficiency, safety, and reliability.

Why Choose Bosch?

• Bosch parts are known for being reliable and lasting a long time, saving you money in the long run. • They work well right out of the box, so you can get back on the road quickly and easily. • Bosch invests a lot in research and development, meaning they’re always improving their parts with the latest technology. • Whether you drive a newer car or an older one, Bosch has a wide range of parts to fit your vehicle. Bosch delivers excellence, FixParts Online delivers to your door.