The EGR valve works by recirculating a measured amount of the exhaust gases back into the engine through the air intake system, reducing the number of emissions the engine produces. The problem lies with the exhaust gas that contains carbon deposits, this gas is constantly being recirculated through the engine, which over time will cause a build-up of the carbon deposits in the intake manifold and other parts including the EGR valve. This build-up in the valve is often what causes them to fail.
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