Fuel system or vacuum leak??

Asked by Ben Aug 29, 2020 at 01:44 PM about the 2002 Nissan Altima 3.5 SE

Question type: Maintenance & Repair

I have a P0171 Bank 1 lean code, I have replaced almost
every part on the vehicle and still can't find the issue !!!
Please help me !!!

7 Answers
40,360

TDolby answered 3 years ago

P0171 is usually a vacuum leak, smoke test the vehicle.

1 people found this helpful.
Mark helpful

Ben answered 3 years ago

Did a full smoke leak down test with no noticeable leaks under 10psi of pressure as well...pulled the fuel injectors and all are testing correct resistance, all have power, all are brand new with 50 miles on them. Also have a New OEM fuel pump, New OEM MAF sensor, New NTK Cam & Crank sensors, New NGK coils and plugs, new valve covers, new intake, new full custom made BRM stainless steel exhaust...I'm stumped‍♂️

Mark helpful

Ben answered 3 years ago

So, I took apart the whole top end of the motor, did a compression test, did a fuel pressure test & voltage drop test, cleaned all the fuel injectors, bought new plugs, swapped the upper the O2 sensors, swapped around the coils, changed all the vacuum lines...The car is running Beautifully and I couldn't be more happy..Fuel trims on all banks are perfect !!! Thank you all for your insight and help !!!

Mark helpful

Your Answer:

Related Questions

  • Fuel system or vacuum leak?? 7 Answers

    I have a P0171 Bank 1 lean code, I have replaced almost every part on the vehicle and still can't find the issue !!! Please help me !!!

    2002 Nissan Altima 3.5 SE

    -

    Maintenance & Repair

  • 2003 altima vacuum diagram 2 Answers

    Can someone please provide the 2003 Altima vacuum diagram? I have a vacuum leak and I am trying to fix it. Thank you.

    2003 Nissan Altima 2.5

    -

    Maintenance & Repair

  • Trouble Shoot problem with fuel system 1 Answer

    My car is having problems getting gas to go through the hose or line when I'm stopped at a light or driving to slow it won't allow me to speed up I have to turn car off pull out fuel injector fuse p...

    2002 Nissan Altima 2.5 S

    -

    Maintenance & Repair

  • Oil leak 1 Answer

    I have a oil leak on the right side. What causes a leak on one side under the hood? MyCar has oil all over the alternator and the belts.

    1999 Nissan Altima

    -

    Maintenance & Repair

  • Fuel pump reset or relay switch on 2013 Nissan Altima 7 Answers

    I had to take the oil cover off of my car and put new spark plugs in and now my car won’t crank, we’re trying to find the fuel relay reset button but we don’t know where it’s located

    2013 Nissan Altima

    -

    Maintenance & Repair

Altima

Looking for a Used Altima in your area?

CarGurus has 37,042 nationwide Altima listings starting at $1,150.

ZIP:

Own this car?

Share your experience with others.

2002 Nissan Altima

Write a car review

Review another car

Shortcuts

Search Nissan Altima Questions

CarGurus Experts

  • #1
    Gene Arnett
    Reputation
    3,250
  • #2
    GuruB42YD
    Reputation
    2,420
  • #3
    GuruSY3ZL
    Reputation
    2,270
View All

Know more, shop wisely

Search

Related Models For Sale

Used Honda Accord
1,560 Great Deals out of 30,432 listings starting at $1,903
Used Toyota Camry
1,988 Great Deals out of 31,391 listings starting at $950
Used Nissan Maxima
252 Great Deals out of 3,651 listings starting at $1,750
Used Nissan Sentra
793 Great Deals out of 35,873 listings starting at $1,299
Used Honda Civic
1,389 Great Deals out of 29,277 listings starting at $1,100
Used Toyota Corolla
1,631 Great Deals out of 22,835 listings starting at $2,450
Used Chevrolet Malibu
1,042 Great Deals out of 18,645 listings starting at $990
Used Hyundai Sonata
863 Great Deals out of 19,616 listings starting at $900
Used Hyundai Elantra
954 Great Deals out of 28,998 listings starting at $1,588
Used Kia Optima
356 Great Deals out of 5,418 listings starting at $965

Used Cars for Sale

2024 Nissan Altima For Sale
66 Great Deals out of 18,438 listings starting at $17,700
2023 Nissan Altima For Sale
355 Great Deals out of 3,914 listings starting at $14,552
2022 Nissan Altima For Sale
197 Great Deals out of 2,709 listings starting at $10,500
2021 Nissan Altima For Sale
166 Great Deals out of 2,707 listings starting at $10,588
2020 Nissan Altima For Sale
161 Great Deals out of 1,976 listings starting at $8,490

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. Content will be removed if CarGurus becomes aware that it violates our policies.