For VW For Touran 2.0 For TDI EGR Cooler Valve 03L131512DQ 03L131512BB 03L131512AT 03L131512AP 03L131512BJ. Reduced exhaust pollutants: Introducing some exhaust gas into the intake manifold and back into the cylinder lowers combustion temperature, reducing nitrogen oxide emissions and meeting environmental standards. 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