ADS77209 Blue Print Knock Sensor

This little guy listens for engine knock – that's a pinging or rattling sound, almost like marbles inside the engine. It's a vibration sensor, really. It picks up those specific frequencies that indicate the fuel – air mixture is detonating instead of burning smoothly. It then sends a signal to the engine control unit, your car's computer. The computer uses that signal to adjust the ignition timing – when the spark plugs fire. Basically, it retards the timing a bit. Think of it like this: if the engine is starting to knock, the computer wants to slow things down a little to prevent damage. It's a crucial part of keeping everything running efficiently and preventing serious problems. It's a feedback system; the sensor tells the computer what’s happening, and the computer makes adjustments. It’s really important because uncontrolled engine knock can destroy an engine pretty quickly. It's like hitting your engine with a hammer repeatedly. The knock sensor acts like a shield, preventing that damage by telling the computer to adjust. If it fails, the engine could run lean and overheat, or experience significant internal wear. You’ll notice if a knock sensor goes bad usually through a check engine light, possibly accompanied by reduced power or poor fuel economy. Sometimes, you might actually hear the knocking sound itself, especially under load or acceleration. You can find these pretty easily online, places like Fixparts Online carry them, but it’s best to get it diagnosed properly first to make sure that is the issue. Drive with confidence: Knock Sensor (MPN ADS77209) is backed by a 12-month warranty!

About Blue Print

Offering exceptional aftermarket solutions, Blue Print is synonymous with reliability and precision for global automotive needs.

Why Choose Blue Print?

• We offer a huge range of parts for European cars – everything from AdBlue tanks to wheel bearings. • Blue Print parts are made to the same standards as original equipment, so you know they’ll fit and work well. • We’re trusted by garages and car owners across the country for quality and reliability. • You get great value for your money – top quality parts at a competitive price. Blue Print delivers excellence, FixParts Online delivers to your door.