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The purpose of an Exhaust Gas Recirculation (EGR) Valve is to improve your vehicle’s economy and performance.

Not only that, but the Exhaust Gas Recirculation Valve also cuts down on emissions because it allows exhaust gases to flow back through the cylinders to get burned again.

Most egr valve failures happen because the valve itself gets stuck open or closed. This is due to build-up of soot particulates, carbon deposits and a sticky tar-like substance. So, A faulty valve should cause an ‘engine check’ light to turn on. This is to inform the driver that something that affects the engine’s emissions is not working correctly. However, before getting to total failure, the valve will slowly degrade in operation.

So,  A Valve that stuck open, will act like a vacuum leak.

Also, A Valve that has failed, refuses to open will allow elevated emissions.