2002 Ford Taurus Q&A
2002 Ford Taurus Question: 2002 ford taurus EGR code P0401 insufficent flow?
Assuming you do not have any defective parts or bad connections it could be a restricted exhaust sytem. Typically the catalytic converter may be stopped up. I have seen repeat faiures of DPFE sensor and in some cases it might even be melted due to the hot exhaust gases backing up. Stopped up EGR ports could happen too. - milesauto