P0401 means no flow at the dpfe sensor. Usually a bad sensor. or bad hoses from egr ports to dpfe.
Trouble code P0401 means: Exhaust Gas Recirculation Malfunction Replace the EGR Valve
this code means there is a problem with the fuel level sensor curcuit
Trouble code P0401 means: Exhaust Gas Recirculation Malfunction
Trouble code P0401 means: Insufficient EGR Flow Detected Replace the EGR Valve
Trouble code P0401 means: Insufficient EGR Flow Detected Replace the EGR valve
Trouble code P0401 means: Exhaust Gas Recirculation Malfunction
Trouble code P0708 means:Transmission range sensor circuit high input
Trouble code P0401 means: Exhaust Gas Recirculation Malfunction
Trouble code P0401 means:Exhaust gas recirculation flow insufficient detected
Trouble code P0401 means:Exhaust gas recirculation flow insufficient detected
Trouble code P1538 means: Intake Manifold Runner Control Stuck Open (Bank 2)
Go to NAPA or AutoZone, they will tell you.