4H0909131 Volkswagen READ COIL

A read coil is basically a type of inductive sensor. It’s designed to detect the position of a toothed or modulated target—often a reluctor ring or tone wheel. It does this by generating an AC voltage signal when that target passes near it. It’s an electrical component, so it’s all about creating that signal. You’ll usually find these on things like crankshaft or camshaft position sensing. It tells the engine control unit exactly where those rotating parts are at any given time. That information is critical for things like fuel injection timing and ignition timing, things that keep the engine running smoothly. It basically provides the brain with crucial information about the engine's mechanical position. If this coil fails, the engine likely won’t run at all, or it'll run really poorly—misfires, rough idling, that sort of thing. It’s a pretty critical component, because if the engine doesn’t know where things are mechanically, it can’t operate correctly. You’ll notice if it goes bad because the car won't start, or it’ll be running extremely rough. It acts like a shield, protecting the engine’s computer from not knowing vital information. We’ve got a good selection of these at Fixparts Online if you’re looking to replace it, and they're usually a pretty straightforward swap. Drive with confidence: Read Coil (MPN 4H0909131) is backed by a 12-month warranty!

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