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Trouble code P0403 indicates a malfunction in the exhaust gas recirculation (EGR) system, specifically related to the EGR control circuit. To fix this code, first inspect the EGR valve and its electrical connections for damage or corrosion. Next, check the EGR solenoid and wiring for continuity and proper function. If these components are in good condition, consider replacing the EGR valve or solenoid, and then clear the trouble code from the vehicle's computer to see if it returns.
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