Slow Down 1-4 light fix | FerrariChat

Slow Down 1-4 light fix

Discussion in 'Mondial' started by Wingnut, Sep 29, 2025 at 6:09 AM.

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  1. Wingnut

    Wingnut Karting

    Joined:
    Feb 11, 2005
    Messages:
    164
    Location:
    Corolla, NC
    Just recently solved my Slow Down 1-4 light (not turning off). Cheap fix!

    What I have:
    -1990 Mondial t cab
    - Aftermarket muffler, removed cats, fitting for thermocouplers in straight pipes

    What I did:
    1) Cut the wires (2) between the ECU and the Thermocouple on the 1-4 side.
    2) Solder in a 20 ohm resistor (2 bucks). Makes the ECU think everything is fine! No more Slow Down light.
     
    Wingnut, Sep 29, 2025 at 6:09 AM
    #1
    Alden likes this.
  2. ZekeD

    ZekeD Karting Rossa Subscribed

    Joined:
    Dec 8, 2023
    Messages:
    74
    Location:
    Sisters, Oregon
    Full Name:
    Zeke Duge
    Wow this should be in the DIY section...... Thanks

    Zeke Oregon USA
     
    ZekeD, Sep 30, 2025 at 11:36 AM
    #2
  3. Alden

    Alden F1 Rookie Rossa Subscribed

    Joined:
    Apr 25, 2010
    Messages:
    3,739
    Location:
    Central Florida
    Done.
    Alden
     
    Alden, Sep 30, 2025 at 8:45 PM
    #3

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