P0400 Error Code: The Engine Light Keeps Coming On ... - 2CarPros

  • HOME
  • ASK A QUESTION
  • REPAIR GUIDES
  • BECOME A MEMBER
  • LOG IN Login with Facebook OR Remember me NOT A MEMBER?FORGOT PASSWORD?
  • CONTACT US
  • PRIVACY POLICY
  • TERMS AND CONDITIONS

P0400 error code Tiny BAYLIS_SARAH
  • MEMBER
  • 2008 FORD FOCUS
  • 1.8L
  • 2WD
  • MANUAL
  • 89,000 MILES
The engine light keeps coming on and when I use a code reader it comes up p0400 exhaust gas re-circulation flow. I have cleaned with erg spray and replaced the air box intake hose. The engine light will come on and then turn off itself a day later so I'm wondering could it be a sensor fault? Not sure what else to try before taking the car to a garage. Wednesday, June 26th, 2019 AT 10:12 AM

1 Reply

Tiny STEVE W.
  • MECHANIC
  • 15,321 POSTS
Welcome to 2CarPros. The usual culprit for this is carbon build up in the EGR passages themselves. Cleaning them involves taking the EGR off and using something like a flexible cable on a drill to knock the carbon build up in the passages free. Sprays don't do much in this case as they cannot get to the area of the build up. On extreme cases the manifolds may need to be removed to clear the passages out. Was this answer helpful?YesNo Wednesday, June 26th, 2019 AT 11:56 AM

Please login or register to post a reply.

Related P0400 Content

2001 Ford Focus Code P0460?

I Have Retrieved A P0460 Code In My Ford Focus! I Have Read Many Forums About It But Nothing Seems To Give Me A Clear Answer.I Have Added A...Asked by luisito123 · 3 ANSWERS2001FORD FOCUS

2004 Ford Focus Obd2 Code P0443

Engine Mechanical Problem 2004 Ford Focus 4 Cyl Front Wheel Drive Manual What Could Be The Problem With This?What May Be The Repair?Asked by hubba · 1 ANSWER2004FORD FOCUS

My Focus Hesitates And Loses Power And Has Engine Code...

My 2007 Focus Hesitated And Lost Power, Then Produced Engine Code. Shutting Off Engine For 5-10 Minutes Allows Me To Start And Drive Again...Asked by Big Fella · 1 ANSWER2007FORD FOCUS

2001 Ford Focus How To Access Engine Codes

The Check Engine Light Stays On. How Can I Access The Engine Codes Without A Code Reader?Asked by glastarpilot · 1 ANSWER2001FORD FOCUS Ask a Car Question. It's Free!Code Read Retrieval/Clear Mercedes BenzCode Read Retrieval/Clear Mercedes BenzHow to Clear a Check Engine?How to Clear a Check Engine?Topdon OBD2 Scanner Review - This thing rocksTopdon OBD2 Scanner Review - This thing rocks
  • Contact•
  • Help•
  • About•
  • Privacy Policy•
  • Terms & Conditions
© 1999 - 2025 2CarPros, Inc.

Tag » Code Reader P0400