EGR Modules for AUDI A4

The Exhaust Gas Recirculation (EGR) for vehicles of the brand AUDI A4 valve is nowadays a part of almost every diesel engine. The EGR valve function allows diesel engine exhaust emissions to be reduced and also reduces fuel consumption. It is a device that returns a measured amount of flue gas back to the engine intake unit and thereby lowers the combustion temperature by reducing the amount of oxygen in the fuel mixture.

This component has been installed in cars with the advent of the Euro 3 emission standard. Since the introduction of EGR valves, their system has evolved, and therefore almost all parts are now controlled electronically by the main engine control unit.

The soot buildup is the biggest problem causing the EGR valve system to fail. Soot mostly end up in the flap through which valve regulates the amount of exhaust gas that goes back into the engine. Excessive amounts of carbon in the EGR valve can be caused by long-term vehicle operation at a lower acceleration value when the valve chamber becomes carbonized. In the case of failure of this component, a slow onset of symptoms can be observed until a final failure. All of this is due to the slow deposition of soot and disabling motion of the EGR valve flap. In some cases, the flap may remain open or become stuck and may cause damage to the engine intake.