What problems will a faulty egr valve cause in 2004 Hyundai sonata?

A faulty EGR (Exhaust Gas Recirculation) valve in a 2004 Hyundai Sonata can lead to several issues, including rough idling, reduced engine performance, and increased emissions. It may also cause the check engine light to illuminate and result in poor fuel economy. Additionally, failing to address a malfunctioning EGR valve can lead to potential damage to other engine components over time.