The EGR in a diesel engine plays a significant role in your vehicle's overall performance, but what is it exactly? Here's everything you need to know.

Gasoline EGR valves are very similar to high-pressure ones. The vacuum created by cylinder depression draws the exhaust gases in, and the flow is regulated by the opening and closing of the EGR valve.

An EGR valve replacement for my Audi A6 isn't covered under warranty - is this fair? I own a 2013 Audi A6 diesel, which for the past six weeks has sporadically gone into limp home mode with the engine ...

A look into the exhaust gas recirculation, or EGR, valve - an important piece of the automotive emissions system.