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Thread: O2 Sensor

  1. #1

    Default O2 Sensor

    Hey folks new guy here,

    I changed my O2 sensor (code was P0155 02 1) cleared the code and a day later the same code came back. Any thoughts?
    Thanks.

  2. #2
    Jr. Engineer
    Join Date
    Oct 2013
    Location
    weedsport, NY
    Posts
    212

    Default

    what vehicle? some have 4 o2 sensors!

  3. #3

    Default

    P0155 is for bank 2 sensor 1 ( should be the sensor closest to the exhaust manifold on passenger side) heater circuit malfunction. which one did you replace?

  4. #4

    Default

    I replaced replaced the one closest to the exhaust manifold. I also cleaned the MAF sensor. My vehicle is 2002 s-10 extreme.
    Thanks

  5. #5

    Default

    Quote Originally Posted by acorn77 View Post
    I replaced replaced the one closest to the exhaust manifold. I also cleaned the MAF sensor. My vehicle is 2002 s-10 extreme.
    Thanks

    This Code Refers to the Front Oxygen Sensor on Bank 2....Sensor 1....The Heated Circuit in the Oxygen Sensor Decreases time needed to Enter Closed Loop. As the O2 Heater reaches Operating Temperature, the Oxygen Sensor Responds by Switching according to Oxygen content of the Exhaust Surrounding it.

    The ECM Tracks how long it takes for the Oxygen Sensor to begin Switching, T
    he ECM Determines (Based on Coolant Temp) that too much Time Elapsed before the Oxygen Sensor began Operating Properly, It will Set a P0155.......

    ....The Cause for this Code, is one or more of the following has happened,
    * O2 Heater Element Resistance is High
    * Internal Short or Open in the Heater Element
    * O2 Heater Circuit Wiring High Resistance
    * Open or Short to Ground in the Wiring Harness


    ....Possible Solutions....Repair Short or Open or High Resistance in Wiring Harness or Harness Connectors, also Replacing the Oxygen Sensor"Cannot Repair the Open or Short that Occurs Internally to Sensor".....
    Last edited by 99'HEARTBEAT; 03-09-2014 at 08:48 AM. Reason: Added Infor.

    MIKE


    99"SILVERADO
    5.3 l 3.73 l G80
    BLACK BEAR CUSTOM TUNE
    SNUGTOP l COLORMATCH l KATZKIN










  6. #6

    Default

    Which manifold? what engine?

  7. #7
    Jr. Apprentice
    Join Date
    Apr 2014
    Location
    DFW Area, Texas
    Posts
    17

    Default

    As I have figured out on my last project: check the wiring!

    Wags
    1992 Chevrolet S10 Blazer
    4.3L, TBI, 4x4

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