Audi VW Exhaust Gas Recirculation System Regulator Flap - OE Supplier 03G128063T

The Exhaust Gas Recirculation (EGR) System Regulator is responsible for distributing EGR gases back into the intake system to be re-burned to reduce NOx emissions. Because diesel engines run quite efficiently and require less fuel in the combustion process compared to their gasoline counterparts, the air/fuel mixture tends to be more lean - meaning more air. Because of this, NOx levels on a diesel engine tend to be much higher. Putting a more strict emissions system on your TDI helps to reduce the NOx levels being emitted from the tailpipe. Typical fault symptoms of this flip include reduced function and also a check engine light.