How to Fix a p0404 Code

p0404  P0404 EGR Valve malfunction #P0404 #EGR_Valve #Fix  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

A P0404 code indicates a potential issue with the exhaust gas recirculation system in a vehicle It means that the EGR valve is not P0404 is a EGR circuit code You most likely have an exhaust or intake leak which is why it's running rich Check the engine bay for soot or oil

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 Mazda6 - P0404 keeps returning even with new EGR - Had a P0404 fault code