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

13,485

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.

29,045

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
    1,960
  • #2
    Tom Demyan
    Reputation
    1,870
  • #3
    Danny Wang
    Reputation
    1,720
View All

Related Models For Sale

Used Chevrolet Malibu
1,129 Great Deals out of 62,899 listings starting at $880
Used Honda Accord
1,119 Great Deals out of 74,857 listings starting at $1,100
Used Chrysler 300
314 Great Deals out of 19,596 listings starting at $900
Used Nissan Maxima
324 Great Deals out of 21,950 listings starting at $1,200
Used Toyota Camry
1,130 Great Deals out of 87,385 listings starting at $995
Used Buick LaCrosse
380 Great Deals out of 17,337 listings starting at $1,295
Used Nissan Altima
1,430 Great Deals out of 78,280 listings starting at $1,695
Used Chevrolet Silverado 1500
2,747 Great Deals out of 175,329 listings starting at $955
Used Chevrolet Tahoe
829 Great Deals out of 42,143 listings starting at $1,987
Used Ford Mustang
600 Great Deals out of 39,959 listings starting at $1,895
Used Ford Taurus
242 Great Deals out of 15,306 listings starting at $1,800

Used Cars For Sale

2018 Chevrolet Impala LS For Sale
1,437 listings starting at $21,585
2017 Chevrolet Impala LS For Sale
14 Great Deals out of 1,246 listings starting at $15,990
2016 Chevrolet Impala LS For Sale
5 Great Deals out of 249 listings starting at $12,950
2015 Chevrolet Impala LS For Sale
4 Great Deals out of 236 listings starting at $10,985
2014 Chevrolet Impala LS For Sale
3 Great Deals out of 299 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.