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Speed sensor

Discussion in '348/355' started by F355Bob, Oct 4, 2011.

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  1. F355Bob

    F355Bob Formula 3

    Nov 4, 2003
    2,002
    Madison, Wisconsin
    #1 F355Bob, Oct 4, 2011
    Got code 4123 on both engine banks. I think this is the speed sensor. Car runs fine. What does this sensor do and any problem driving until I fix it?
     
  2. plugzit

    plugzit F1 Veteran
    Silver Subscribed

    Dec 1, 2004
    7,792
    Redondo Beach, CA
    Full Name:
    Bruce Bogart
    #2 plugzit, Oct 4, 2011
    If it is the speed sensor, it simply counts the revolutions of the transmission and sends info to the speedometer. Not critical, but you may get some wierd speedo readings.
     
  3. 2NA

    2NA F1 World Champ
    Consultant Owner Professional Ferrari Technician

    Dec 29, 2006
    18,221
    Twin Cities
    Full Name:
    Tim Keseluk
    #3 2NA, Oct 4, 2011
    Not part of the engine management system.
     
  4. mpodgor

    mpodgor Formula Junior

    Aug 15, 2005
    661
    San Mateo, Ca.
    Full Name:
    Michael J Podgorski
    #4 mpodgor, Oct 5, 2011
    Is your speedometer reading normal?
     
  5. F355Bob

    F355Bob Formula 3

    Nov 4, 2003
    2,002
    Madison, Wisconsin
    #5 F355Bob, Oct 5, 2011
    Did not even look at the speedo, all I could see were those two check engine lights.
    I have not driven the car since but the lights would go off at idle but soon as the car moved, the lights went back on, so likely the speedo was not working. Will check that tonight.
     

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