This sensor’s job is pretty straightforward – it monitors the speed and position of your engine’s crankshaft. Basically, it tells the engine control unit – the car’s computer – exactly where each piston is in its cycle. It does this by reading teeth or notches on a wheel connected to the crankshaft and sending that info back to the computer as an electrical signal. It’s a pretty simple device, but that signal is crucial. Think of it as a key piece in a whole bunch of systems. Fuel injection relies on it – the computer uses that crankshaft position to know when to spray fuel into the cylinders. Ignition timing too – it needs to know where the crankshaft is to spark the plugs at exactly the right moment. Modern vehicles also use this data for things like traction control and even cruise control. It’s not something that works in isolation; it's central to how the engine runs. If this sensor starts to fail, you’ll probably notice it right away. Usually, it'll start with a rough idle, maybe some hesitation when you accelerate. It can also cause the engine to stall, or even refuse to start at all. It acts like a shield protecting the engine from running improperly. Because the computer gets bad information, it can’t control the fuel and ignition correctly. Ignoring a failing sensor can lead to bigger problems down the road – things like damaging the catalytic converter. You can find these pretty easily online; Fixparts Online has a good selection, and getting a replacement is usually a pretty easy DIY job if you’re comfortable with a few basic tools. If not, a mechanic can swap it out quickly. Reliable performance guaranteed: Impulse SE (MPN 038957147C) has a 12-month warranty!

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• Get parts made specifically for your VW, ensuring a perfect fit and reliable performance. • Volkswagen parts are quality-tested to meet strict standards, so you can drive with confidence. • Using genuine VW parts helps maintain your vehicle’s value and original engineering. • We offer a wide selection of parts and accessories, so you can find exactly what you need to keep your VW running smoothly. Volkswagen delivers excellence, FixParts Online delivers to your door.