This valve basically recirculates a portion of your exhaust gas back into the engine’s intake. It doesn’t sound like something you’d want to do, right? But it lowers combustion temperatures. It’s a pretty simple mechanical thing, usually controlled by engine vacuum or electronically these days. Some have solenoids, some are just vacuum – operated diaphragms. Think of it like this: exhaust gas doesn't burn well, so adding it back into the fresh air/fuel mix slows down how quickly everything combusts. This is mainly to reduce NOx emissions – those nitrogen oxides are big contributors to smog. It's an emissions control component, first and foremost. It’s part of the whole system working to keep your car environmentally friendly and pass inspections. If this valve fails, you’ll notice if it’s stuck open or closed. A valve stuck open can cause rough idling, poor fuel economy, and even prevent the engine from starting. A valve stuck closed doesn’t recirculate enough exhaust, so you’ll likely get a check engine light, and the car won’t pass an emissions test. It acts like a shield against those harmful NOx gases, and when it’s not working right, it lets those emissions get out there. You can find replacements for most makes and models at places like Fixparts Online, and honestly, it’s a pretty common repair. It's something that will eventually wear out, especially with higher mileage. Adaptable to any vehicle: Valve (MPN 079121678K) comes with a 12-month warranty!

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• Audi parts are made specifically for your vehicle, ensuring a perfect fit and optimal performance. • Using genuine Audi parts helps maintain your vehicle's value and original quality. • Audi parts are rigorously tested to meet high safety and durability standards, giving you peace of mind. • You’ll get reliable performance and keep your Audi running like new with parts designed by the original manufacturer. Audi – trusted quality, available at FixParts Online!