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How to Clean the EGR Valve Without Removing It

Model: (Various brands) Various
Part: EGR valve

The EGR valve functions to reintroduce some exhaust gases back into the intake to reduce NOx emissions: constant contact with exhaust gases, which are often contaminated with oil vapours and unburnt diesel, tends to dirty the valve to the point of blocking it. If it remains open, exhaust gases continue to enter the intake, negatively affecting performance and increasing smoke; the recommendation is to remove the valve and perform a thorough cleaning of the intake manifold, however, you can also opt for specific cleaners while being cautious of any dislodged deposits that may cause damage.

Updated on 11 March 2026 by ScegliAuto

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