Code P0402 Chevy Duramax

Causes and Fixes P0402 Code: Exhaust Gas Recirculation Flow Excessive Detected

How to fix P0402 Code: Exhaust Gas Recirculation Flow Excessive Detected What is an EGR Valve? The EGR valve reduces emissions by allowing burnt exhaust gases to go back into the engine. This lowers the engine combustion temperature, which reduces Nitrogen Oxide (NOx) emissions. An EGR valve can be vacuum-controlled and electronically ...

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