Hello,
It is possible that the EGR valve itself is not functioning properly and needs to be replaced. If the cleaning does not fix it can be a malfunctioning valve.
Here is a video on how to test the EGR valve:
https://youtu.be/DqUCbbKdWf4
The best course of action would be to take a step-by-step approach and check off a few items.
I have attached the troubleshooting guide for the code P1404 below.
Go through these and let me know what you find or if you have any questions.
Thank you.
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Saturday, January 22nd, 2022 AT 5:09 PM