What are the symptoms of a faulty EGR in an engine?

[MacMadison]

EGR valve failure symptoms include: engine malfunction, reduced engine power, etc. Affecting normal engine operation: A faulty EGR valve can disrupt normal engine operation, leading to unstable idling or stalling at idle, flashing warning lights, oil burning, power loss, black smoke from the exhaust pipe, and other phenomena that affect vehicle performance. Reduced engine power: If the EGR valve is damaged and remains stuck open, it can cause the engine to stall at idle, have unstable idling, experience weak acceleration or increased fuel consumption, along with a noticeable decrease in engine power. Impact on vehicle exhaust emissions: If the EGR valve is damaged and remains stuck closed, it will affect the vehicle's exhaust emissions, potentially causing them to fail to meet standards, which could result in failing the annual inspection.