What are the symptoms of a stuck erg valve on a 02 mazda millenia?

A stuck erg (EGR) valve on a 2002 Mazda Millenia can lead to several symptoms, including poor engine performance, rough idling, and increased emissions. You may also notice a decrease in fuel efficiency and potential engine knocking due to improper combustion. Additionally, the check engine light may illuminate, indicating a problem with the exhaust gas recirculation system.