The DTC code P0401 states the exhaust gas recirculation flow is insufficient and it could be a faulty sensor or solenoid. Does anyone have any idea which sensor needs replacement?

Asked by Feb 08, 2014 at 01:50 PM about the 2004 Mercury Mountaineer 4 Dr STD SUV

Question type: Maintenance & Repair

1 Answer

72,435

Sounds like the EGR (Exhaust Gas Recirculation) valve and/or tubes are clogged. HTH. -Jim

2 of 2 people found this helpful.

Your Answer

Mercury Mountaineer Experts

  • #1
    Tom Demyan
    Reputation
    600
  • #2
    kbro
    Reputation
    460
  • #3
    tuff4x4
    Reputation
    300
View All

Related Models For Sale

Used Ford Explorer
1,228 Great Deals out of 69,461 listings starting at $1,000
Used Mercury Mariner
41 Great Deals out of 1,086 listings starting at $1,250
Used Ford Escape
1,266 Great Deals out of 103,789 listings starting at $1,200
Used Ford Expedition
377 Great Deals out of 17,283 listings starting at $1,489
Used Jeep Grand Cherokee
1,055 Great Deals out of 72,187 listings starting at $1,195
Used Ford F-150
3,279 Great Deals out of 221,661 listings starting at $1,200
Used Lincoln Navigator
84 Great Deals out of 3,748 listings starting at $1,795
Used Dodge Durango
366 Great Deals out of 24,208 listings starting at $1,500
Used Chevrolet Tahoe
787 Great Deals out of 41,984 listings starting at $1,987
Used Nissan Murano
421 Great Deals out of 23,158 listings starting at $400
Used Nissan Pathfinder
498 Great Deals out of 25,216 listings starting at $2,388
Used GMC Yukon
600 Great Deals out of 20,736 listings starting at $2,500
Used Lincoln Aviator
232 listings starting at $1,499

Used Cars For Sale

2010 Mercury Mountaineer For Sale
3 Great Deals out of 72 listings starting at $5,957
2009 Mercury Mountaineer For Sale
21 listings starting at $7,995
2008 Mercury Mountaineer For Sale
3 Great Deals out of 142 listings starting at $3,500
2007 Mercury Mountaineer For Sale
5 Great Deals out of 148 listings starting at $2,799
2006 Mercury Mountaineer For Sale
7 Great Deals out of 160 listings starting at $1,899

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.