Question:
An EGR (Exhaust Gas Recirculation) valve is a device that reduces nitrogen oxide emissions by recirculating some exhaust gases into the intake manifold. The valve should be replaced when it is no longer functioning properly, which can cause problems such as rough idle, engine hesitation or acceleration issues, reduced fuel economy and increased emissions. Signs of a faulty EGR valve may also include the illumination of the check engine light on the dashboard.