ESG valve: what is it and what does it mean for our car

EGR valve (Exhaust Gas Recirculation, or Gas Recirculation for its abbreviation in English) is a component of the exhaust system of a diesel or gasoline engine designed to reduce nitrogen oxide (NOx) emissions in the exhaust gases.

It works by recirculating a small amount of exhaust gases back into the engine’s intake system. By mixing these gases with fresh air entering the power unit, the amount of oxygen available for combustion is reduced, which reduces the formation of NOx in the exhaust gases.

It is activated and deactivated by a position sensor that monitors the state of the engine and determines when EGR is needed. This valve opens and closes electrically or pneumatically, allowing exhaust gas recirculation when activated.

However, the EGR valve also causes problems in the engine if it is not working properly, because the carbon dioxide and water present in said gases can accumulate in the intake system, causing corrosion and blockage.

It can also stick or misfire, resulting in engine performance problems (loss of power and increased fuel consumption). In this regard, it is important keep the exhaust gas recirculation valve clean and in good condition to ensure smooth engine operation as well as compliance with emission regulations.


The EGR valve is important for several reasons, as helps reduce nitrogen oxide (NOx) emissions. Too much can improve engine performance by reducing fuel consumption, since by recirculating the exhaust gases back into the intake system, the amount of oxygen available for combustion is reduced.

Finally, it appears as a key component in the emission control system of modern vehicles. Compliance with it is mandatory to control emissions standards, so manufacturers must include an EGR system in engines.

Author: Ronald Ortega
Source: La Opinion


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