O2 Sensor

Discussion in 'Chevy S10 Forum (GMC Sonoma)' started by acorn77, Mar 8, 2014.

  1. acorn77

    acorn77 New Member

    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?
  2. zuki82

    zuki82 Member 1 Year 100 Posts

    what vehicle? some have 4 o2 sensors!
  3. edsmagichands

    edsmagichands Member 2 Years 100 Posts

    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. acorn77

    acorn77 New Member

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

    99'HEARTBEAT MODERATOR Staff Member 5+ Years ROTM Winner 1000 Posts Platinum Contributor

    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: Mar 9, 2014
  6. edsmagichands

    edsmagichands Member 2 Years 100 Posts

    Which manifold? what engine?
  7. wags391

    wags391 Member

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


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