P0404 - Knackered EGR?

Q&A: P0404 Code - Replaced EGR Valve, Good Short? p0404 What is the P0404 Error Code? The P0404 error code is a specific diagnostic trouble code that signifies a problem with the EGR system's p0404 The engine code is P0404 which refers to the EGR valve I replaced the valve with all new gaskets as it was rusty and the vehicle is at 194K

p0404 EGR code P0404 · When Monitored: Engine running · Set Condition: The EGR flow or valve movement is not what is expected A rationality error