check engine and fuel light on

Asked by Jul 30, 2016 at 10:52 AM about the 2004 Chevrolet Impala LS

Question type: Maintenance & Repair

I have plenty of fuel..n car keep idling low...n then
cut off..had Auto zone read codes off computer
P0401 Insufficient EGR flow detected..
What's wrong with my car??

2 Answers

13,145

If the NOx goes down when the EGR valve is raised (this test is most commonly performed on a Dynamometer), it is likely that one or more EGR passages or cylinders are plugged or very restricted, making the EGR only go to one or two cylinders. When this occurs, you may notice misfires and even have misfire codes along with the P0401. This can occur on vehicles that use EGR "runners" for each cylinder. Others can learn from this..In your case I would do a quick check of the MAF and IAC someone who knows what their doing can diagnose and correct this fast.

27,035

A P0401 code and bad/rough idle means you have a problem with the EGR valve or it's DPFE sensor. The incorrect fuel reading is likely caused by a bad fuel sending unit (its mounted inside the fuel tank). The fuel sending unit and the EGR circuit are separate things, in other words you have more than one thing wrong with your car.

1 of 1 people found this helpful.

Your Answer

Chevrolet Impala Experts

  • #1
    Js08016
    Reputation
    1,880
  • #2
    Tom Demyan
    Reputation
    1,800
  • #3
    Danny Wang
    Reputation
    1,680
View All

Related Models For Sale

Used Chevrolet Malibu
975 Great Deals out of 66,469 listings starting at $1,000
Used Honda Accord
1,083 Great Deals out of 56,431 listings starting at $899
Used Nissan Maxima
283 Great Deals out of 22,801 listings starting at $1,499
Used Chrysler 300
302 Great Deals out of 17,877 listings starting at $990
Used Toyota Camry
995 Great Deals out of 79,612 listings starting at $1,200
Used Buick LaCrosse
303 Great Deals out of 18,174 listings starting at $1,450
Used Ford Mustang
617 Great Deals out of 36,130 listings starting at $1,800
Used Chevrolet Silverado 1500
2,265 Great Deals out of 168,160 listings starting at $1,000
Used Chevrolet Tahoe
733 Great Deals out of 41,251 listings starting at $1,995
Used Nissan Altima
986 Great Deals out of 76,877 listings starting at $1,627
Used Ford Taurus
188 Great Deals out of 15,843 listings starting at $1,850

Used Cars For Sale

2018 Chevrolet Impala LS For Sale
1,369 listings starting at $21,316
2017 Chevrolet Impala LS For Sale
10 Great Deals out of 1,789 listings starting at $16,990
2016 Chevrolet Impala LS For Sale
4 Great Deals out of 272 listings starting at $11,285
2015 Chevrolet Impala LS For Sale
4 Great Deals out of 255 listings starting at $10,900
2014 Chevrolet Impala LS For Sale
4 Great Deals out of 327 listings starting at $9,700

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.