"low voltage" on all 4 O2 sensors, 1996 F355 | FerrariChat
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"low voltage" on all 4 O2 sensors, 1996 F355

Discussion in 'Technical Q&A' started by k wright, Dec 13, 2006.

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  1. k wright

    k wright F1 Rookie

    Feb 4, 2004
    2,544
    North East TN
    Full Name:
    Kent Wright
    #1 k wright, Dec 13, 2006
    Got this code recently. Looking in the wiring diagrams the only common element that I can see is the grounds and the heater supply. I'm thinking that there is a plug somewhere that needs some work.

    Anyone else with this experience? Did a search and found one thread with this but no resolution other than "the problem disappeared after I switched the battery off".

    Thanks
     
  2. Steve Magnusson

    Steve Magnusson Two Time F1 World Champ
    Lifetime Rossa

    Jan 11, 2001
    26,931
    30°30'40" N 97°35'41" W (Texas)
    Full Name:
    Steve Magnusson
    #2 Steve Magnusson, Dec 13, 2006
    Don't have the wiring diagram so I can't comment about a direct fault, but one thing to check is that your air injection air pump is not running at warm idle (i.e., when the coolant is above 50 deg C, it should not run).

    If you measure the voltages on the O2 sensors during warm idle, are they truly "low"?
     
  3. k wright

    k wright F1 Rookie

    Feb 4, 2004
    2,544
    North East TN
    Full Name:
    Kent Wright
    #3 k wright, Dec 13, 2006
    Air pump works normally. I'll measure the O2 sensors tonight as well as replace them.

    Thanks
     
  4. k wright

    k wright F1 Rookie

    Feb 4, 2004
    2,544
    North East TN
    Full Name:
    Kent Wright
    #4 k wright, Dec 13, 2006
    No change in the operation of the car after 4 new O2 sensors. Checking the ground wire on all four sensors reads 5.1 mOhms with the key in run position, motor stationary.

    ken
     
  5. No Doubt

    No Doubt Seven Time F1 World Champ

    May 21, 2005
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    Mr. Sideways
    #5 No Doubt, Dec 14, 2006

    Switch your DMM over to Volts.
     
  6. f355spider

    f355spider F1 World Champ
    Owner Rossa Subscribed

    May 29, 2001
    18,055
    USA
    #6 f355spider, Dec 14, 2006
    Not sure I would have replaced them, until I had proper power to them....as they will throw another code if they are indeed bad.
     

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