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Thread: Drivetrain malfunction

  1. #1
    Join Date
    May 2011
    Posts
    2

    Drivetrain malfunction

    Drivetrain malfunction
    Hey everyone I was driving last night and check engine came on after a few seconds Drivetrain malfunction came on the screen (2013 alpina b7) . I took it to autozone to get a code on it and it came up with bunch of different codes. P0171, P10FA P0172. When the car is idle it feels like its about to die on me. Any ideas?

  2. #2
    Join Date
    Feb 2018
    Location
    Colorado Springs
    Posts
    7
    My Cars
    2012 BMW 750i xDrive
    Here's what I found.
    Engine PCode Code Label ECU Variant ECU Label Fault Info
    N63 P0171 29E0 Mixture control MSD85 Engine electronics
    N63 P0171 2A2B Mixture control MSD85 Engine electronics
    N63 P0171 29E0 Mixture control MSD85Y Engine electronics
    N63 P0171 2A2B Mixture control MSD85Y Engine electronics
    N63 P0171 118001 Mixture control: mixture too lean MSD85L6 Digital Motor Electronics View
    N63 P0171 118401 Mixture control: Fuel-air mixture too lean, large deviation MSD85L6 Digital Motor Electronics View
    N63 P0171 118001 Mixture control: mixture too lean MSD85YL6 Digital Motor Electronics View
    N63 P0171 118401 Mixture control: mixture too lean; large deviation MSD85YL6 Digital Motor Electronics View
    N63 P0171 118001 Mixture control: Fuel-air mixture too lean N63TU_R0 Digital Motor Electronics View
    N63 P0171 118401 Mixture control: Fuel-air mixture too lean, large deviation N63TU_R0 Digital Motor Electronics View
    N63 P0171 118001 Mixture control: Fuel-air mixture too lean DME8FF_R Digital Motor Electronics View
    N63 P0171 118401 Mixture control: Mixture too lean, deviation too high DME8FF_R Digital Motor Electronics View
    N63 P0171 118010 Mixture control, cross-bank: Fuel-air mixture too lean DME8FF_R Digital Motor Electronics View

    N63 P10FA 119304 Rail pressure sensor, plausibility: Pressure too high before engine start
    Engine PCode Code Label ECU Variant ECU Label Fault Info
    N63 P0172 29E0 Mixture control MSD85 Engine electronics
    N63 P0172 2A2B Mixture control MSD85 Engine electronics
    N63 P0172 29E0 Mixture control MSD85Y Engine electronics
    N63 P0172 2A2B Mixture control MSD85Y Engine electronics
    N63 P0172 118002 Mixture control: mixture too rich MSD85L6 Digital Motor Electronics View
    N63 P0172 118402 Mixture control: Fuel-air mixture too rich, large deviation MSD85L6 Digital Motor Electronics View
    N63 P0172 118002 Mixture control: mixture too rich MSD85YL6 Digital Motor Electronics View
    N63 P0172 118402 Mixture control: mixture too rich; large deviation MSD85YL6 Digital Motor Electronics View
    N63 P0172 118002 Mixture control: Fuel-air mixture too rich N63TU_R0 Digital Motor Electronics View
    N63 P0172 118402 Mixture control: Fuel-air mixture too rich, large deviation N63TU_R0 Digital Motor Electronics View
    N63 P0172 118002 Mixture control: Fuel-air mixture too rich DME8FF_R Digital Motor Electronics View
    N63 P0172 118402 Mixture control: Mixture too rich, deviation too high DME8FF_R Digital Motor Electronics View
    N63 P0172 118011 Mixture control, cross-bank: Fuel-air mixture too rich DME8FF_R Digital Motor Electronics View

    I pulled these codes from http://bmwfault.codes/.
    Last edited by Carbonblack12; 10-30-2019 at 02:53 PM.

  3. #3
    Join Date
    Feb 2018
    Location
    Colorado Springs
    Posts
    7
    My Cars
    2012 BMW 750i xDrive
    There was a delay in posting and I just didn't have the time to wait for an admin to approve it yesterday, sorry. What I wanted to say was to check you engine bay and listen to how the motor is running. Just know that the Coil Over Plugs or COPs are just pressed into place. If you have recently hit a pothole or somehow jostled them, it's good to have a look by just removing the cover and pressing on the COPs. While you are there, make sure the MAS/MAFs are still plugged into the intake tubes. Check your exhaust of white smoke or black smoke. White means lean, while black or dark smoke means rich.

    Another thing, I have noticed that immediately driving off without letting your car warm up for even a minute could cause erroneous readouts when it is cold out. Remember relays stick in cold weather.

    I'm sure you have an update on how the car is running.

  4. #4
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    P codes are worthless. If you want to diagnose and repair your vehicle yourself, get a scanner that can read and show BMW specific codes. It'll be well worth the extra cost over a cheap P code reader.

    Mixture control problems can be caused by a number of things, so you've got some work to do unless you take it to a reputable BMW repair facility (not just any Joe Blow mechanic shop). Vacuum leaks, low fuel pressure, faulty MAF sensors, etc just to name a few.
    ASE and BMW Master Certified Technician

  5. #5
    Join Date
    May 2017
    Location
    Phoenix, AZ
    Posts
    9
    My Cars
    2014 BMW 750i
    Quote Originally Posted by White94RX View Post
    P codes are worthless. If you want to diagnose and repair your vehicle yourself, get a scanner that can read and show BMW specific codes. It'll be well worth the extra cost over a cheap P code reader.
    Can you pl recommend a couple of the scanners you like / have experience with? What's the price range for these?

  6. #6
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    I work at a dealership and only use ISTA. I don't have any experience with anything else. Sorry. Maybe someone else will chime in and give a recommendation.
    ASE and BMW Master Certified Technician

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