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EGR code P0406 after installing new set of ignition coils

Tiny
P71GUY
  • MEMBER
  • 2003 FORD CROWN VICTORIA
  • 4.6L
  • V8
  • 131,000 MILES
Car has new EGR valve since January 2021. Worked well, no codes. Yesterday I installed 8 new ignition coils. Car runs great, except it now shows EGR code p0406! I've only run car about 50 miles. Will code eventually go away as cars computer adjusts to new coils?
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Thursday, April 8th, 2021 AT 4:30 PM

4 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good evening,

There is no adjusting to the new coils. The code is for the Delta pressure sensor and is a very common failure. I attached the description and procedure for you below for the repair.

Roy
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Thursday, April 8th, 2021 AT 5:05 PM
Tiny
P71GUY
  • MEMBER
  • 2 POSTS
Hi. Thank you for your reply. I see the images but not sure what procedures I'm supposed to do.
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Thursday, April 8th, 2021 AT 7:18 PM
Tiny
DANNY L
  • MECHANIC
  • 5,648 POSTS
Hello, I'm Danny.

Just here to add. Here is what you need to test relating to the EGR code P0406. I've attached 2 pictures below. Hope this helps and let us know if you have any further questions on this issue. Thanks again for using 2CarPros.
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Thursday, April 8th, 2021 AT 10:01 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I suggest changing the Feedback sensor for the code. It was a very common failure.

Roy
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Friday, April 9th, 2021 AT 2:45 AM

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