What is an exhaust gas recirculation (EGR) valve?
The EGR valve recirculates a portion of your exhaust gasses, sending them back into the intake manifold to reduce nitrogen oxide emissions from your engine. The engine can then burn them again, and stabilize the combustion temperature, thus lowering overall emissions.
There are two types of EGR valves:
Electronic EGR valves: Uses a solenoid, which opens and closes based on cues from the vehicle’s ECU or PCM.
Manual EGR valves: Uses an engine vacuum to open and close the valve.
When should I replace the exhaust gas recirculation (EGR) valve on my car?
The most common symptoms of a faulty EGR valve include:
Check engine light: Your vehicle's engine control unit (ECU) or powertrain control module (PCM) will detect issues with your EGR valve or system and illuminate the check engine light. Your mechanic can scan the vehicle for diagnostic trouble codes associated with the EGR valve.
Higher emissions: Your EGR valve is meant to reduce nitrogen oxide and hydrocarbon emissions, so if it’s not working properly, your vehicle’s emissions will increase.
Rough idling: Your engine may vibrate more than usual if your vehicle is dealing with a bad EGR valve.
Lower fuel economy: Your vehicle will consume more fuel and your gas mileage will decrease if your EGR valve is broken.
Engine stalling or hesitating during acceleration: A bad EGR valve can cause your engine to hesitate or stall.
Lower engine performance: Your car may not receive as much power from the engine if your EGR valve is faulty.
Strange engine noises: You may hear knocking or pinging noises from your car’s engine if your EGR valve is in bad shape. These noises come from higher combustion temperatures, which can cause engine damage over time.
Exhaust scent or smoke: If you detect an exhaust smell or smoke from your engine bay, there could be something wrong with your EGR valve.
How often should an exhaust gas recirculation (EGR) valve be replaced?
With proper maintenance, an exhaust gas recirculation (EGR) valve can last up to ten years on average. Regular maintenance can help your EGR valve last longer, including cleaning out the EGR tubes and the intake manifold.
Keep in mind: Sometimes the EGR valve malfunctions because the ports, tubes, and intake manifold are clogged with carbon deposits. Instead of replacing the EGR valve, you’ll need to clean the system to resume optimal functioning.
Can I replace my exhaust gas recirculation (EGR) valve myself?
There are usually limited steps involved in an exhaust gas recirculation valve replacement. If you feel confident in your DIY auto repair skills, you may be able to complete the replacement yourself.
For most drivers, it’s a good idea to let a professional mechanic replace your EGR valve. A correct replacement is vital to your vehicle’s overall performance, and your mechanic will know exactly how to properly get the job done.