1 – Check Engine Light

If the “Check Engine” light on your vehicle’s dashboard turns on, your car’s computer is letting you know there is a problem with a specific part or system in your vehicle. One possibility is a bad EGR valve.

Since an illuminated Check Engine light can indicate any of over a hundred issues, a specific trouble code relating to the part will need to appear. Commonly, the trouble code for an EGR problem is P0400.

2 – Weak Engine Power

If there is an EGR valve problem, the first symptom you’ll notice is a performance problem with the engine. If your EGR valve is malfunctioning or just clogged, the air-to-fuel ratio of your vehicle will be disrupted.

This will cause all kinds of engine problems like a reduction in acceleration, fuel efficiency, and power.

3 – Rough Engine Idle

A common symptom that arises from a bad EGR valve in a vehicle is something called rough idle. When malfunctioning occurs with EGR valves, they end up stalling in their open position. Then a rough idle will form from the recirculation of the exhaust gas, no matter if there are desirable conditions or not.