Both powertrain codes, but you'll need a book to be certain check the library for one you can use free.. dave P0301 is Cylinder #1 misfire. P0401 is Excessive EGR Flow. Replace the spark plugs and wires and reset the light. If it comes back on then you probably need to remove and clean the throttle body and egr valve...right inside the intake manifold is a air port that runs down to the egr valve...it will be plugged with carbon...clean this port with carb cleaner and compressed air. This should fix it.
Trouble code P0402 means:Exhaust gas recirculation flow excessive detected
Trouble code P0402 means:Exhaust gas recirculation flow excessive detected
Trouble code P0402 means:Exhaust gas recirculation flow excessive detected
Trouble code P0402 means: Exhaust Gas Recirculation Flow Excessive Detected Replace EGR valve
Trouble code P0402 means: Exhaust Gas Recirculation Flow Excessive Detected
Trouble code P0402 means: Exhaust Gas Recirculation Flow Excessive Detected
Trouble code P0402 means:Exhaust gas recirculation flow excessive detected
Trouble code P0402 means: Exhaust Gas Recirculation Flow Excessive Detected
Trouble code P0402 means: Exhaust Gas Recirculation Flow Excessive Detected
P0402 - EGR excessive flow detected
My Chilton repair manual shows code P0402 as EGR flow at idle fault and my Haynes repair manual shows code P0402 as EGR excessive flow detected
No,Its has to do with the EGR valve