The Audi A4 was initially introduced as a four-door saloon/sedan. During its development, many popular EGR valve parts have been built. But the properly functioning Audi A4 EGR valve can increase the engine's efficiency through reduced heat injection and throttling losses.
Whereas, the worn EGR valve parts need to be repaired or replaced for better A4 performance. Signs of bad Audi A4 EGR valve parts include poor engine performance, fuel smell, rough idling, and engine knocking. The Audi A4 EGR valve parts should be replaced every 50,000 miles. We are online for you 24/7. Our large assortment covers the majority of classic vehicles.