This little part basically controls the flow of exhaust gases. It only lets gases move in one direction – away from the engine. Think of it like a one – way street for exhaust. It prevents backflow, so gases don't sneak back into the system when the engine isn’t running or when there’s a pressure difference. It’s a pretty simple concept, but it’s key for a few things. Usually you'll find these in exhaust gas recirculation systems – EGR for short – or in things like turbocharger oil return lines. In an EGR system, it makes sure exhaust gases only go to the intake, not back the other way. In a turbo setup, it prevents oil from flowing backwards out of the turbocharger when the engine is off. Sometimes you’ll see them connected to the evaporative emissions system, too. If a check valve fails, you’ll likely notice a rough idle, a check engine light – often with codes related to EGR flow or system leaks – and potentially a loss of power. A failing one can mess with your engine’s efficiency and emissions. Sometimes, it can even lead to damage to other parts if things get backflowing that shouldn't be. They’re not super expensive, and replacing a bad one is often pretty straightforward. Fixparts Online carries a good selection if you’re looking to get one. You’ll notice if one is bad, typically. Trusted brand, trusted warranty: Check Valve (MPN 7.05817.00.0) has a 12-month guarantee!

About Pierburg

Pierburg specializes in emission control, air supply, and fuel systems for sustainable and efficient vehicles.

Why Choose Pierburg?

• Pierburg parts are known for lasting a long time, even in tough conditions. You won’t have to replace them constantly. • We make parts for a lot of different car brands, so there’s a good chance we have what you need. • Our parts help your car run efficiently, which can save you money on gas. • Pierburg has been making quality auto parts for over 100 years – we have the experience to get it right. Pierburg – trusted quality, available at FixParts Online!