355 - O2 sensor monitor not ready | FerrariChat
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355 O2 sensor monitor not ready

Discussion in '348/355' started by yelcab, Sep 20, 2023.

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  1. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,379
    San Carlos, CA
    Full Name:
    Mitchell Le
    #1 yelcab, Sep 20, 2023
    This is on a 5.2 Motronic. This is the only monitor left not ready. I even have brand new O2 sensors in all 4 locations. Does anyone know how to get this monitor to go Ready?
     
  2. Zamboniman308

    Zamboniman308 Formula Junior

    Feb 2, 2020
    504
    Chicago IL
    #2 Zamboniman308, Sep 20, 2023
    Is it reading O2 ok? if Yes
    Do you have any check engine light or pending codes? If No
    You just need to drive it. It may need a few full drive cycles to be good to go from an emissions standpoint.
     
  3. JoeCab

    JoeCab Formula Junior
    Silver Subscribed

    May 27, 2014
    364
    Colorado
    Full Name:
    Joe C
    #3 JoeCab, Sep 28, 2023
    This one can be tough to get to set.

    And in most places you can pass with one emissions monitor not ready, but it can't be the 02 Sensor monitor.

    If you've already tried the "normal" drive cycles and this monitor is still being stubborn, one tip I've been told to get the O2 sensor monitor to set is to get the car up to 80 or so and then slam the throttle shut and let it coast down in gear. The longer the coast down the better so a long downhill road helps.
     
  4. johnk...

    johnk... F1 World Champ
    Owner

    Jun 11, 2004
    11,141
    CT
    Full Name:
    John Kreskovsky
    #4 johnk..., Sep 28, 2023
    Last edited: Sep 28, 2023
    Which, sensor? Bank x, sensor y?

    Codes?

    Possibilities:

    Bad heater

    Wires

    Plug not connected right.

    Defective sensor.
     
  5. yelcab

    yelcab F1 World Champ
    Consultant

    Nov 29, 2001
    13,379
    San Carlos, CA
    Full Name:
    Mitchell Le
    #5 yelcab, Sep 28, 2023
    In the end, I reset the two pending codes that were preventing the monitor selftest to begin. Then I drove two complete drive cycles. The last one with 8 miles of 35 mph in 4th gear, and fully idle for 10 minutes, then drive normal for 10 minutes. The monitors were all set. In all, six drive cycles ... damn.
     
    johnk... likes this.

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