EGR N18 vacuum regulator solenoid valve. 1.9 TDI PD from VAG Group. Family of diesel engines with injection pump-injector
Solenoid valve of the EGR N18 vacuum regulator
The EGR N18 vacuum regulator solenoid valve allows the exhaust gas recirculation system to mix some of the exhaust with fresh air entering the engine. This lowers the combustion temperature and reduces the formation of nitrogen oxides. To control the amount of exhaust gas returned for combustion, the direct fuel injection engine control module J248 activates the EGR N18 vacuum regulator solenoid valve with duty cycles based on internal control charts.
Consequences of breakage
Engine efficiency will deteriorate and exhaust gas recirculation will not be ensured.
Read more about the family of diesel engines with injection pump-injector here .