my car's check engine light came on.the car runs fine, uses a little more fuel than it used to but it has new plugs,wires and air filter. upon hooking it to a scanner the code is po401 then it says egr flow insufficient. is this a bad egr valve? or just a clogged line or what? i don't want to just start replacing parts. i'd like to know the exact problem and then the fix. any help would greatly be appericated!!!
Jan 3, 2009 at 2:05 PM
