How to Diagnose and Fix P0404 Engine Code

code p0404  Detailed information on troubleshooting and repairing a p0404 automotive trouble code which refers to an EGR circuit range or performance issue Also includes 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

Some vehicles may store EGR control performance code P0404 This occurs when the difference between commanded and actual EGR valve position is more than 10% If it is only showing p0404 then that is the signal not being reliable from the egr to the pcm I would firstly fit a blanking plate to the egr

The glow plug light flashes all the time after around 3 mins after you start the van I took it to a garage and they read the fault code which was P0404 EGR Code P0404 is triggered when the EGR position is not as the ECM expected and the most common cause is the EGR valve partly stuck open from carbon buildup on the