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First off Your Honda is really an Isuzu Rodeo, but you already knew that. These have the GM electronic egr. if you have the 3.2 motor. The only way to fix it is to replace the egr valve.
== you can find a good answer in this site: http://www.obd-codes.com/trouble_codes/generic/p0401-ins
EGR System, insufficient flow detected, maybe bad sensor?Your sensor is more than likely fine. It is
I was looking up the same thing and came across these answers:hope it helps... "very well be that th
AnswerIt's not the valve. I've never worked on an acura. but it's not the valve. they rarely short o
Trouble code P0401 means: EGR System MalfunctionReplace the EGR Valve
Trouble code P0401 means:Exhaust gas recirculation flow insufficient detected