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Usually you replace the egr valve.
You replace the EGR valve.
A 1997 Dodge Ram doesn't have a EGR valve.
replace the egr valve
change the egr valve
Replace the EGR valve.
If it's a 2.4 L DOHC motor, there is no EGR valve.
Normal cause if a failed egr valve.
in ya mum
p0401 is related to EGR valve flow. Possible bad EGR, check passageway under EGR to see if its plugged See also for the DPFE before changing the EGR Valve.
take the EGR valve off and spray carb cleaner in the egr valve and in the port. This will some times work as it gets plugged up