Difference between f355 upstream and downstream o2 sensor | FerrariChat

Difference between f355 upstream and downstream o2 sensor

Discussion in '348/355' started by vincentf355, Jun 25, 2013.

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  1. vincentf355

    vincentf355 Rookie

    Feb 24, 2010
    35
    Full Name:
    vincent tseng
    #1 vincentf355, Jun 25, 2013
    Last edited by a moderator: Sep 7, 2017
    Just to share photos regarding different pins of factory upstream 169953 and downstream 165170 o2 sensors of my 97 f355. Regardless how hard I have tried searching o2 sensor threads, funny I just happen to realize there are difference by looking at the pins after I replaced factory ones with Bosch part 13819 and 13820.
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  2. cavlino

    cavlino Formula 3
    Silver Subscribed

    Mar 6, 2002
    1,740
    Ottawa, Canada
    Full Name:
    Carm Scaffidi
    #2 cavlino, Jun 25, 2013
    I noticed that too last year when I was replacing my cats, never thought of posting a picture though, good of you to do that :)
     
  3. JohnAnthony

    JohnAnthony Rookie

    Nov 2, 2008
    33
    Astoria, NY
    Full Name:
    John Anthony
    #3 JohnAnthony, Jun 25, 2013
    on older cars i think the Post/downstream sensors only trigger a Cat-Deficiency Code they don't impact performance

    the Pre/Upstream sensors are obviously reading how well your engine is firing/running
     
  4. vincentf355

    vincentf355 Rookie

    Feb 24, 2010
    35
    Full Name:
    vincent tseng
    #4 vincentf355, Jun 25, 2013
    Wish I realized factory ones' difference earlier so that I was able to check Bosch parts before they were installed. I am curious to know what Bosch parts look like.
     

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