1. Rough idling: The engine may idle rough or stall when the EGR valve is not functioning properly.
2. Reduced engine performance: The vehicle may experience reduced power and acceleration when the EGR valve is not able to recirculate exhaust gases into the engine.
3. Increased fuel consumption: The engine may consume more fuel when the EGR valve is not working properly.
4. Check engine light: The check engine light may illuminate on the dashboard when there is a problem with the EGR valve or sensor.
5. Emission problems: The vehicle may fail emission tests if the EGR valve is not functioning properly.
6. Knocking or pinging sound: You may hear a knocking or pinging sound from the engine when the EGR valve is not working properly.
7. Engine hesitation or surging: The engine may hesitate or surge when accelerating or decelerating when the EGR valve is not working properly.
8. Poor fuel economy: The vehicle may get worse gas mileage when the EGR valve is not working properly.
9. Increased emissions: The vehicle may produce more emissions when the EGR valve is not working properly.
It is important to note that these symptoms can also be caused by other problems with the vehicle, so it is important to have a qualified mechanic diagnose the problem if you are experiencing any of these symptoms.
