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What is the function of the exhaust gas recirculation (EGR) valve in the Audi A1?

I noticed my Audi A1 has an EGR valve, but I'm not sure what it does. Can anyone explain how it works and why it's important?

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The EGR valve is responsible for recirculating a portion of exhaust gas back into the engine cylinders. This helps reduce the amount of harmful emissions released into the environment.

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