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Thread: "Lost" mileage due to bad speed sensor when odometer and speedometer not working?

  1. #1
    Join Date
    Dec 2014
    Location
    Chicago, IL
    Posts
    349
    My Cars
    '01 740iL

    "Lost" mileage due to bad speed sensor when odometer and speedometer not working?

    In February of 2016 my '01 740il threw the "trifecta" lights on the dash (DSC, Brake, ABS) which was remedied by having the the driver front speed sensor replaced.

    Last month I got the trifecta again, only this time the speedometer and odometer stopped working as well (mileage did not advance).

    I estimate I drove maybe 45-60 unaccounted for miles before having the driver rear speed sensor replaced which fortunately fixed everything.
    (I didn't even notice the mileage wasn't accruing for the first day or two...)

    However, the mileage in the cluster didn't "catch-up".

    My understanding (thanks to blackknight530i) is that the car's mileage and VIN are stored in 3 places:

    1) Cluster
    2) Light Control Module (LCM)
    3) EWS (immobilizer module)

    Not a huge deal for such a small difference, but if the mileage is now different between the cluster and LCM/EWS is there a way to sync it back again?
    Last edited by rijhsing; 12-04-2017 at 02:15 PM.

  2. #2
    Join Date
    Apr 2007
    Location
    Kansas City, MO
    Posts
    6,718
    My Cars
    2x01 750, 01 740
    Mileage won't be different if there was no wheel speed sensor accruing it.
    See my E38 parts for sale on eBay: click here!
    PM me here for a 5% discount on any of them!

  3. #3
    Join Date
    Jan 2006
    Location
    Ft. Lauderdale, FL
    Posts
    5,083
    My Cars
    98 740il, 00 540i,04 ZHP
    Yeah, none of those 3 places saw a change in mileage, so they are all reading the same.
    '98 740il | 9/97 build | schwarz 2 | sandbeige | 5AT | 270k
    '04 330i ZHP sedan | Mystic blue | Alcantara | 6MT | 120k
    '00 540i sport | Titanium silver | Black | 5AT | 152k
    '85 Mustang GT convertible | Medium charcoal metallic | Gray | 5MT | 216k | one owner, all original

    mods: m-pars | Bilsteins & B&G springs | ValentineOne | StealthOne
    retrofits: full nav | MKIV | bluetooth TCU | BM53 w/ AUX input | video module w/ AV input & backup cam | oem sirius xm | xenon | shades | PDC | rain sensor | BMW DWS TPMS | lighted door handles | front seat heaters | heated steering wheel | euro rear fog lights | ski pass | folding mirrors


  4. #4
    Join Date
    Dec 2014
    Location
    Chicago, IL
    Posts
    349
    My Cars
    '01 740iL
    Ahhh, makes sense, didn't think of that. Thanks guys.

  5. #5
    Join Date
    May 2011
    Location
    Maine
    Posts
    268
    Had the trifecta for like 8 days. Now it’s gone! I’m gonna remove, clean and swap side on all 4 speed sensors. If that doesn’t do it I’ll replace all 4. What do you think of that plan?

  6. #6
    Join Date
    Jan 2006
    Location
    Ft. Lauderdale, FL
    Posts
    5,083
    My Cars
    98 740il, 00 540i,04 ZHP
    Take a look at the sensor wiring. That is likely the problem causing a short. The insulation falls apart after a while.
    '98 740il | 9/97 build | schwarz 2 | sandbeige | 5AT | 270k
    '04 330i ZHP sedan | Mystic blue | Alcantara | 6MT | 120k
    '00 540i sport | Titanium silver | Black | 5AT | 152k
    '85 Mustang GT convertible | Medium charcoal metallic | Gray | 5MT | 216k | one owner, all original

    mods: m-pars | Bilsteins & B&G springs | ValentineOne | StealthOne
    retrofits: full nav | MKIV | bluetooth TCU | BM53 w/ AUX input | video module w/ AV input & backup cam | oem sirius xm | xenon | shades | PDC | rain sensor | BMW DWS TPMS | lighted door handles | front seat heaters | heated steering wheel | euro rear fog lights | ski pass | folding mirrors


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