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lean codes
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  1. E46 (1999 - 2006)
    2004 325ci 5spd 175,000 miles ----------------- purchased 4 months ago ----------------- LTFT was at 11.4% STFT was at 4% MAF 2.8 warm 3.8 cold changed oil, and replaced homemade CAI with stock air box and replaced in-cabin air filter STFT shot up to 27.3% and LTFT hangs out around 30%...
  2. X3 E83 (2004 - 2010)
    2005 Bmw X3 3.0i. 138k miles I have watched all the videos and read through so many threads with no answers. I have replaced intake gaskets, CCV system including o-rings, (With the FCP kit), intake boot, DISA valve(About two years ago but tested it to see that it still worked.) plugged all vac...
  3. E46 (1999 - 2006)
    This is my first post on any BMW forum so lets hope it goes well. A few months ago I got P0171 and P0174 codes on my 2004 330ci, did some research and my own diagnosis on my car. No vacuum leaks as far as I have checked but I still replaced my ccv system anyways because it was old and brittle...
  4. E46 (1999 - 2006)
    Hello again! Another issue with my 2003 330Ci (Sure glad I've registered on the forum), when taking apart the car and removing the oil pan, what seem to be a vacuum line from a fuel filter fell off. Which means it probably wasn't properly attached and needed to be fixed anyway. A bit of a...
  5. X3 E83 (2004 - 2010)
    2006 BMW X3 3.0 Throwing codes p0171 and p0174 band 1 and 2 are too lean. I ran live diagnostics on the car while driving. The O2 Bank 1 and 2 sensors short term fuel trim is showing at a constant 92%. The data also says the fuel system is maintaining an open loop on system b. Why wouldn't the...
  6. X3 E83 (2004 - 2010)
    I posted this in the transfer case forum which is separate from the engine issues of lean codes I am getting. I will post all the codes I am getting and please let me know what you think. —“”””””” Hi folks, Car specs: 2005 BMW X3 3.0l 182,000 miles Here is the issue: triad of lights (abs...
  7. E46 (1999 - 2006)
    I am a professional mechanic, with some BMW experience and got roped into working on my nephews 2003 325xi. 3 months ago I replaced the oil pan gasket. While under the car noticed a coolant leak. Pulled the intake and replaced it all (with OE parts), coolant lines the PCV system and some...
  8. E46 (1999 - 2006)
    Hello all, First post here so excuse any of my lack of proper part names. I am throwing some lean codes 0171 and 0174, changed the intake hoses but found that the smaller of the two hoses from the elbow on top of the upper intake hose (right after the MAF) was not connected to anything, just...
  9. X3 E83 (2004 - 2010)
    So recently the check engine light came on in my wife's X3. I got it diagnosed at the local dealership and was told that I had lean banks 1 & 2, shooting codes PO174 &171. They gave me a statement saying i had a bad vanos oil line leak, bad oil level sensor, bad ccv (oil seprator) and all the...
  10. E39 (1997 - 2003)
    The code only lights up after about 15 minutes worth of driving, which for my daily commute is when I am driving on the highway. And on the following trip, the SES light will go out promptly after start up, only to light up again after 15 minutes as stated. The pattern has repeated without fail...
  11. E39 (1997 - 2003)
    i have a 2001 525i and it runs good but occasionally i get lean codes for bank 1 and 2. i have looked high and low and cannot find where a leak may be coming from. the intake boot is ok. the hoses are all plugged in and not cracked. i did recently take apart the oil separator system to replace...
  12. E36/7 Z3 (1996-2002)
    Hi; I'm planning to replace my stock 18lb fuel injectors with new Bosch 24lb injectors as part of some upgrades I'm doing (larger MAF and new programming; Conforti) and would like to replace the upper and lower o-rings as part of upgrade. Problem is that BMW does not list a p/n for the lower...
  13. X5 E70 (2007 - 2013)
    Hey all So my 2011 went in for the vanos bolt recall at BMW Manhattan 2 weeks ago. I have about 27,600 on the odometer, never a hiccup. Work was done, took car home, had an obvious oil leak (smoke from under hood). Brought it back, they couldn't find the leak. Took it home and took pictures...
  14. E39 (1997 - 2003)
    Just bought a 2003 e39 530i with the following codes! P0171 P0174 P0300 P0336 P1083 P1085 P1348 P1351 P1353 P1512. I thought I got a good deal until I took it home. The car is leaking oil, (not a lot) it idles okay when it wants to, however sometimes shuts off. Also, there are times when it...
  15. E46 (1999 - 2006)
    so my car decided not to start last week, & the check engine light came on. here are the codes i pulled from it: P0171 Bank 1 too lean P0174 Bank 2 too lean P1083 Fuel control limit too lean Bank 1 Sensor 1 P1085 Fuel control limit too lean Bank 2 Sensor 1 i checked the vacuum hoses, maf, air...
  16. E39 (1997 - 2003)
    How to make/borrow/buy lean-condition-misfire test tools (smoke, vacuum, & pressure)? Lean-codes diagnosis DIY-priced test tools only! Q: What are some cost efficient tools we can borrow, make, or buy (at DIY prices) to effectively test for lean-misfire conditions? Specifically: Can we...
  17. E39 (1997 - 2003)
    Over in this thread, we have listed almost two dozen part numbers and SAE-equivalent sizes for the specific pipes (rigid), hoses (multiple materials), tubes (single material), endcaps, and O-rings that can be the cause of vacuum leaks in the M54 (and M62) engine: - Summary list of all...
  18. E39 (1997 - 2003)
    I have a 2003 BMW 525i e39 (M54 engine) with 136k miles. Just replaced the DISA air intake valve, stil getting codes P0171 and P0174 (lean mixture) and P1342, P1344, and P1347 (misfire cylinders 1-3). The car has a new coolant system 15k miles ago (radiator, hoses, water pump, AND valve cover...
  19. E39 (1997 - 2003)
    I'm trying to locate all the vacuum hoses in the E39: > Might we be able to list, with pics (realoem diagrams ok) of ALL E39 vacuum lines? The realoem diagrams come up short in explaining exactly where the ends are for some of the hoses. May I ask the tribe to pitch in and identify, for all...
  20. E39 (1997 - 2003)
    Given these two M54 engine vacuum hoses: Q1: Is this the correct part number for the large hose on the F-connector? Q2: Is this the correct part number for the small hose on the F-connector? In summary, since it's really hard to tell which hoses these are, may I ask if these two diagrams...
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