Code P0401 2001 Ford Escape is intermittent.

Question

---------I have replace the DPFE and the EVR solenoid twice. I have also replaced the ERG valve. I have checked all the vacuum line and all are good. I have connected and inline vacuum gauge between the EVR and the EGR and it will show that there is vacuum and everything will be fine then a few minutes later it will show there is no vacuum. I will drive a few more miles then it will start working again. Does anyone have an idea where to look next? Does the EVR solenoid receive it's info from the ECM or from the DPFE? I'm starting to lean towards a bad ECM.

Answer 1

Hi there,

Here is a list of possible causes for an EGR code.

P0401 FORD - Exhaust Gas Recirculation Flow Insufficient Detected

Read more: https://www.autocodes.com/p0401_ford.html