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The fault code P0408 indicates a problem with the Exhaust Gas Recirculation (EGR) sensor circuit, specifically pertaining to the EGR sensor's performance or its electrical circuit. This code may suggest issues such as a faulty EGR sensor, wiring problems, or a malfunctioning EGR valve. It can lead to reduced engine efficiency and increased emissions. Diagnosing the specific cause typically involves checking the sensor, wiring, and EGR system for any faults.
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