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Thread: cant read Memory Control Modules

  1. #1
    Join Date
    May 2016
    Location
    Long Island NY
    Posts
    21
    My Cars
    97 850ci

    cant read Memory Control Modules

    just purchased a 1997 850ci and needed a inspection and the car failed because BMW could not get a reading from the
    Memory Control Modules. they asked if I had replaced or disconnected the battery , I told them no but when I received the car a week ago I had to re enter the radio code. they said that I have to put some miles on the car and then they will retry. Does this make sense and if so how many miles do I have to drive before retest? already at 110 miles

  2. #2
    Join Date
    Feb 2010
    Location
    Hampshire UK
    Posts
    7,074
    My Cars
    99 840ci Sport Indv
    There should be no problem reading any of the modules after the battery has been disconnected - they all have non-volatile memory in the OBDII cars...
    Timm..2007 E64 650i Individual Sport..1999 E31 840ci Individual Sport..ex owner of 2000 E38 740..1999 E38 740i V8 M62..1998 E38 735i V8..1993 E32 730i V8..1988 E28 518i


    My Current 840ci Sport Individual
    My Current 650ci Sport Individual
    My E31 Repair and Information Website
    My E38 Repair and Information Website
    My E63/E64 Repair and Information Website

    Chase - Heroes to a generation

  3. #3
    Join Date
    Mar 2006
    Location
    Harrisburg, PA, USA
    Posts
    266
    My Cars
    x5, 640i, 850Ci, 850CSi
    Actually I went through a similar thing a while back. My car occasionally throws a random check engine code that Iím still chasing down, but one time it happened a day or two before my scheduled appointment for inspection. I had to put 500 miles on it before they could read whatever code they are reading during these inspections.

    Iím also assuming this only applies to OBD-II cars.

    Mike Barrett


    Sent from my iPhone using Tapatalk
    Mike Barrett
    94 850CSi, Hellrot over silbergrau dunkel/silbergrau hell
    96 850Ci, Oxfordgrun over silbergrau hell

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