EGR Valve For VW For SCIROCCO For TIGUAN For TOUAREG For TOURAN 2.0 For TDI 03G131501 03G131501G 03G131501P 03L131501K. Reduced exhaust pollutants: Introducing some exhaust gas into the intake manifold and back into the cylinder lowers combustion temperature, reducing nitrogen oxide emissions. It maintains reliable operation even in extreme engine environments and protects the engine from damage caused by abnormal pressure. Exhaust gas dilutes the air-fuel mixture, reducing combustion intensity, resulting in smoother operation. EGR is generally turned off during idling, acceleration, and high loads to prevent insufficient power and unstable idling., Manufacturer: changqishangmao1