Nissan Navara EGR Cleaning this is the best way to clean the Navara D40 EGR valve save some money before replacing the EGR valve.
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What is the role of the EGR valve? In a nutshell, the EGR is there to reduce emissions. It does this by rerouting some of the exhaust gases coming from the engine back into the combustion chambers in the engine. This has the effect of reducing the temperatures within the combustion chambers.