answersLogoWhite
Ask
Check Engine Light
Ford Expedition XLT
Ford Explorer Sport

What can you check or replace if the check engine light comes back on and the code is P401 and you have already replaced the EGR valve?

606162
Answer

Top Answer
User Avatar
Wiki User
2015-07-17 17:55:32
2015-07-17 17:55:32

Check the EGR selenoid valve. The vacuum will pass throught the defective selenoid valve and go the EGR valve even if it has not been activated. The ECM will not detect a defective selenoid valve - only an EGR problem.

DPFE sensorIf it's a Ford product, you may need a DPFE sensor. You should also check for a restriction in the EGR passageway.
1
0

Related Questions

User Avatar

To replace the check engine light bulb, you will need to remove the dashboard. Once you have removed the dashboard, the bulb for the light will be exposed and can be changed.

User Avatar

2006 Lexus gs300 awd check engine on after spark plugs replaced

User Avatar

You need to test/replace the knock sensor. ireplaced it already.

User Avatar

I have a 98 mystique, and when the check engine light comes on, I simply disconnect the positive battery terminal for a couple of minutes. When I replace it, the check engine light is cleared. It resets the computer.


Copyright © 2020 Multiply Media, LLC. All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.