Thread: 3.1 chevy lumina code p0401 help

So ok guys my girls lumina is putting up a p0401 code and I know it's around the egr now my question is how to trouble shoot this, and were the EGR is located on the engine? the engine is a 3.1l motor year 96 info would be greatly appreciated thanks

First things first bud.. you gotta google or look up the code. That way you can post the name of it etc. Always a big help to those helping you.

The 1996 3.1 says the same thing. EGR flow Insufficient.

This is something some one ask on a website but I have no idea where the sensor or little device is at

most likely you have an EGR port clogged with carbon build-up, common on these 3.1L and 3.4L engines. remove the throttle cable bracket and look down the PCV tube hold on top of the intake. also check the PCV operation and ensure its not sucking oil out of the valve cover. if it is, oil will fall on top of the EGR port. may be easier to remove throttle body to clean carbon build up.

Hope this helps a lil



This is what I found on google not quite sure what it really means ?