5Q0905849C Volkswagen ignition s

Basically, the ignition coil takes the relatively low voltage from your car's battery and boosts it up to a super high voltage—tens of thousands of volts. It’s that high voltage spark that actually ignites the fuel inside your engine's cylinders, making it go boom and power the car. Each cylinder generally has its own coil, though some older vehicles might share. They’re all about transforming electricity. Think of it like this: the battery is the starting pistol, and the ignition coil is what actually fires the bullet that gets things moving. It’s a critical part of the engine’s ignition system. It gets the signal from the car's computer, and then steps up the voltage to create that spark. Without a working coil for each cylinder, that cylinder won't fire, and the engine won't run smoothly—or maybe not at all. Well, a failing ignition coil can cause a whole bunch of problems. You’ll notice if your engine starts misfiring – it'll feel like a stumble or jerkiness when you're driving. You might get a check engine light, and it could hurt your gas mileage. Sometimes it’s a gradual decline, other times it’s a sudden failure. A bad coil can even damage your catalytic converter if it causes a lot of unburnt fuel to go through the exhaust. They don't last forever, and when they go, they need to be replaced. You can find a good selection of ignition coils at places like Fixparts Online, and they're not usually too difficult to replace yourself if you’re handy, but it's always best to get it checked out by a mechanic if you’re not comfortable doing it. More than just a part: Ignition Coil (MPN 5Q0905849C) includes a 12-month warranty!

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