I have a code po174 system too lean that keeps coming on on my 2003 Lincoln navigator, I've changed all o2 sensors, a vent hose, checked maf, sprayed carb cleaner lookin for leaks an can't find anything, anyone else had this problem?

Asked by Oct 29, 2015 at 02:08 PM about the 2003 Lincoln Navigator Luxury

Question type: Maintenance & Repair

1 Answer

71,455

Other causes are: Plugged fuel filter, low fuel pressure (bad fuel pump) bad fuel regulator or leaking regulator, dirty injectors, leaking vacuum line, pcv leaking, stuck or bad egr valve and bad maf.

1 of 1 people found this helpful.

Your Answer

Add photo

Related Questions

Search Lincoln Navigator Questions

Lincoln Navigator Experts

#1 jimmyarango
jimmyarango
Reputation 1,480
#2 T_S_T
T_S_T
Reputation 420
#3 dandyoun
dandyoun
Reputation 320
View All

Related Models For Sale

Used Ford Expedition
453 Great Deals out of 25,036 listings starting at $1,495
Used Cadillac Escalade
209 Great Deals out of 11,028 listings starting at $3,000
Used Chevrolet Tahoe
587 Great Deals out of 32,673 listings starting at $1,500
Used GMC Yukon
398 Great Deals out of 20,215 listings starting at $2,495
Used Chevrolet Suburban
260 Great Deals out of 19,855 listings starting at $1,800
Used Cadillac Escalade ESV
114 Great Deals out of 5,435 listings starting at $1,995
Used GMC Yukon XL
206 Great Deals out of 12,709 listings starting at $2,000
Used Ford Explorer
1,002 Great Deals out of 70,330 listings starting at $997
Used Ford F-150
2,069 Great Deals out of 208,407 listings starting at $290
Used Nissan Armada
159 Great Deals out of 8,839 listings starting at $3,000
Used Lincoln Aviator
5 Great Deals out of 254 listings starting at $2,500
Used INFINITI QX56
64 Great Deals out of 1,383 listings starting at $4,999
Used Dodge Durango
298 Great Deals out of 21,328 listings starting at $1,500
Used Toyota Sequoia
132 Great Deals out of 5,463 listings starting at $2,795

Used Cars For Sale

2017 Lincoln Navigator For Sale
5 Great Deals out of 3,225 listings starting at $45,391
2016 Lincoln Navigator For Sale
12 Great Deals out of 476 listings starting at $36,500
2015 Lincoln Navigator For Sale
5 Great Deals out of 235 listings starting at $31,900
2014 Lincoln Navigator For Sale
14 Great Deals out of 190 listings starting at $21,995
2013 Lincoln Navigator For Sale
8 Great Deals out of 156 listings starting at $15,995

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.