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  1. 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...
  2. 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...
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