Acura TL P04021 code for EGR insufficient flow issue requiring intake manifold cleaning on Acura TL

Some Acura TL owners report experiencing issues related to the P0401 code, which indicates "Exhaust Gas Recirculation Flow Insufficient Detected." These problems often require cleaning of the integrated EGR ports in the head, typically done using throttle cleaner through the vacuum port of the EGR valve. Additionally, some owners find that removing the intake manifold and the metal runner plate is necessary to effectively clean the EGR ports. Common repairs for the P0401 code include cleaning or replacing the EGR valve, as carbon buildup can cause the valve to become stuck, leading to insufficient exhaust gas flow. It is also recommended that owners inspect the EGR valve and passages for clogging, check the EGR vacuum solenoid and regulator for proper function, and test the EGR temperature sensor for accurate readings to address these issues effectively.