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Ford f150 – p0171 lean bank 1 – Auto Repair Chat

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Let's have a look at this 97 Ford F150 with the classic P0171 "Lean Bank 1" code that seems to happens to these Fords more often than not. Typically it is a vacuum leak at or near the manifold but this one turns out to be a bit different. -Enjoy!
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50 thoughts on “Ford f150 – p0171 lean bank 1”
  1. Avataaar/Circle Created with python_avatars Bob M says:

    I would think the holes in the manifold would not draw air in based on the location. The exhaust would be under high pressure forcing air out not in. Where as any other point beyond where all the tubes join would create a draw “in” as the pressure decreases and passes a leak hole creating a siphon.

  2. Avataaar/Circle Created with python_avatars big chungus says:

    It’s easy to link your business success to your common sense approach to each customer’s situation and needs and your tremendous troubleshooting skills. I only wish you were in Spokane, WA. Great place to live btw…peace out..:)

  3. Avataaar/Circle Created with python_avatars donald kemp says:

    I was wondering what the brakes felt like 👍

  4. Avataaar/Circle Created with python_avatars Orlando Hernandez says:

    This guy loves that money light.

  5. Avataaar/Circle Created with python_avatars steve jette says:

    I just had a local garage tell me that a new MAF is $275 and $170 to install !!!
    Rock auto: $22 cheapest and Denso OEM $61. 2 screws, easiest ever to reach. 4 minutes.
    2001 Toyota Celica. What is wrong with this picture ?

  6. Avataaar/Circle Created with python_avatars Michael White says:

    Since yr brakes are normal it’s the gasket between the master cylinder and booster. I had the exact same codes on a 07 Impala I took the m/c off and that gasket was torn Replaced it it’s been good to go

  7. Avataaar/Circle Created with python_avatars O’Shack Hennessy says:

    One question, if an injector wasn’t putting out enough fuel wouldn’t the LTFT increase rather than decrease with more rpm’s?

  8. Avataaar/Circle Created with python_avatars jarvsstyu says:

    very helpful

  9. Avataaar/Circle Created with python_avatars Jose Hernandez says:

    Thanks for the update 😀

  10. Avataaar/Circle Created with python_avatars Sam's Automotive says:

    What was the fix?

  11. Avataaar/Circle Created with python_avatars Andy Andy says:

    Bad vídeo

  12. Avataaar/Circle Created with python_avatars Tyler James says:

    Was this an ad for break Kleen? 🤣 jk great video very informative. I have a 2000 F150 with the 4.6 and it’s near the end of its life this video was great I’m having a similar issue and really considering how much I want to actually try

  13. Avataaar/Circle Created with python_avatars fireryu85 says:

    Is it the problem?………Its a problem. Haha. I like your sayings.

  14. Avataaar/Circle Created with python_avatars danny phillips says:

    My 2002 5.4 showing that code with a rattling noise !

  15. Avataaar/Circle Created with python_avatars Dustin Farr says:

    Dealing with a similar issue

  16. Avataaar/Circle Created with python_avatars William Denham says:

    so where is this vacuum leak hole under the truck?

  17. Avataaar/Circle Created with python_avatars Up2NoGood says:

    That truck has the all Aluminum metal intake…They hardly ever fail. As my van has the same intake with 200k miles…They have never never leaked..But the hose after the huge air filter likes to come off….And for some strange reason. It only throws a code for Bank 1 when it come off.

  18. Avataaar/Circle Created with python_avatars Vector Brian says:

    Great videos, very informative about fuel trims and leak down test.

  19. Avataaar/Circle Created with python_avatars Jose Rivera says:

    Enjoyed the video! Helps greatly to try to help diagnose where my problem(s) may be. Have to look for a smoker! Have the same engine on my 97 F150 4.6 1997. Just paid 500 to get the drivers side exhausted manifold replaced. Runs better. Though. Now get a P0171 and P0174…. Things just start snowballing on these 20+ year trucks. Suspecting a lazy O2 sensor as they are OG. Also, just had the OG intake manifold solder/patched. Love/hate relationships anyone?!

  20. Avataaar/Circle Created with python_avatars 97lowbo says:

    Regular cab short bed 4×4 v8 5 speed with a camper to top it off ideal truck if you ask me and the information you give us is great thanks for the quality content

  21. Avataaar/Circle Created with python_avatars reddyfreddy says:

    Intake leak? No problem ! Flex-seal will stop that leak! Spritz spritz! No more leaks thanks to flex seals revolutionary secret formula!!!

  22. Avataaar/Circle Created with python_avatars Caleb Rod says:

    28 minutes for a code

  23. Avataaar/Circle Created with python_avatars james haliday says:

    seriously there is a const epoxy in big tube I use all time on metal,plastic ,concrete wood ,it
    is pricy…… but the best ,@ white cap

  24. Avataaar/Circle Created with python_avatars james haliday says:

    Use tanker truck of epoxy,,,,dip lower part o truck… perfect. then sell.

  25. Avataaar/Circle Created with python_avatars Johnson Dave says:

    Good video

  26. Avataaar/Circle Created with python_avatars sconrady123 says:

    What about negative ltft -29?

  27. Avataaar/Circle Created with python_avatars Seth C says:

    Great video covering many possibilities.

  28. Avataaar/Circle Created with python_avatars onefixitman says:

    I learned that I may not repair it.

  29. Avataaar/Circle Created with python_avatars Blue_Country_Boy says:

    I have a 1998 F150 4.6. When I give it gas, it gets even more lean. New fuel pump, filter, and injectors. Where do I check now?

  30. Avataaar/Circle Created with python_avatars Jerry Kegel says:

    Right to the junkyard

  31. Avataaar/Circle Created with python_avatars Jerry Kegel says:

    Would someone put some oil in the crankcase?

  32. Avataaar/Circle Created with python_avatars Steve Hei says:

    Good content. Thanks!

  33. Avataaar/Circle Created with python_avatars baascoe says:

    I've have visited your videos about six times now and you have always helped me fix problems I've been dealing with at the time just want to say I admire your talents and like your style of Diagnostics thank you very much

  34. Avataaar/Circle Created with python_avatars smorrow0816 says:

    Never seen your channel before. Good stuff!

  35. Avataaar/Circle Created with python_avatars two9parkave says:

    Thanks for this, i have the exact problem.

  36. Avataaar/Circle Created with python_avatars Manuel Gutierrez says:

    Very interesting!

  37. Avataaar/Circle Created with python_avatars Christopher Walker says:

    I have i 99 ford f150 and it's show a misfire on cylinder 3 and 2 p0171 p0141 p0161

  38. Avataaar/Circle Created with python_avatars P Thomson says:

    I've never seen a booster rotted like that before!

  39. Avataaar/Circle Created with python_avatars Jack Brown says:

    CHECK YOUR O2 SENSOR BY THE MANIFOLD!!!! that fixed my light even tho the code says to replace maf sensor

  40. Avataaar/Circle Created with python_avatars Don Kim says:

    I have a 2003 with the 5.4l. Bank 2 lean code p0174. Fuel trims are high on bank 2 with not much correction with throttle. What could be the problem?

  41. Avataaar/Circle Created with python_avatars Doug Kubash says:

    I've been wrenching for 40+ years and I really enjoy your videos and pick up some good info to boot!