I had this problem on my Escape. I removed the EGR valve and noticed that a piece of trash was stuck in the valve keeping it from closing and causing this vacuum leak. I took a screw driver and opened the valve to remove the trash. This fixed it.
P0401 - EGR flow insufficient , P0402 EGR flow excessive
How do you replace the EGR Valve on a 2001 Ford Escape?
Start by replacing the DPFE sensor. Autozone about $35.00.newtest3
The generic OBDII descriptions are EGR Flow insufficient and EGR Flow Excessive.
P0402 - EGR excessive flow detected
where'sthe egr flow on a 2000 ford expedetion {code; P0401
Diagnostics
excessive gas flow through the EGR valve
Trouble code P0402 means: Exhaust Gas Recirculation Flow Excessive Detected Replace EGR valve
2001 ford windstar has code PO401 erg insufficent flow.
Plugged EGR passage which restricts the flow of exhaust gasses, faulty EGR solenoid, faulty EGR solenoid wiring/harness, vacuum lines damaged or disconnected to the EGR valve solenoid or to the EGR valve, or a faulty EGR valve.
insufficient egr flow