EGR stands for exhaust gas recirculation. The EGR valve links the intake manifold and the exhaust manifold. It plays a vital role in helping to reduce the amount of NOx emitted from your Mazda.
Over time, EGR valves can become clogged due to a build-up of soot, and when this happens, an EGR valve clean or replacement is required.
Common symptoms of an EGR fault include rough idling, erratic engine functioning (including stalling), increased fuel consumption and higher emissions.
Many manufacturers recommend using an EGR cleaning service every 50,000 miles; doing so helps prevent performance issues and extends the component's life.
EGR valves typically have a lifespan of around ten years. After this time, it's usually best to book an EGR valve replacement for your Mazda if you experience any of the symptoms listed above. A stuck EGR valve will speed up the process of the diesel particulate filter (DPF) becoming blocked.