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P0400 A Flow?

Tiny
ZU
  • MEMBER
  • 2006 FORD MONDEO
  • 1.8L
  • 4 CYL
  • 2WD
  • MANUAL
  • 1,420 MILES
Hi, I have the vehicle listed above mk3 2006 1.8 petrol.
I had PO400 code had EGR value replaced and a 02-lambda sensor also had a new air filter. However, I still get a PO400 A Flow code any ideas how to permanently clear code or anything else I can change?
Thank you
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Thursday, October 5th, 2023 AT 12:24 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,896 POSTS
Hi,

This model isn't offered in the US, but I will try my best to help. As you are already aware, the EGR system is causing the code. When you replaced it, did you check if there was any evidence of carbon build-up where it was attached to the engine? Are there any vacuum-related issues that you are aware of?

Since this is the only code, I question if it is a sensor-related issue, but anything is possible.

I attached possible causes in the pic below. Let me know what you have done to this point.

Take care,

Joe

See pic below.
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Thursday, October 5th, 2023 AT 6:27 PM

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