Question about 2000 Pontiac Sunfire

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How do i connect a 2000 sunfire o2 sensor, which has 4 wires to a 2 wire harness?

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You sure you have the right harness you are trying to attach to? Most have 3 or 4 wires. Heater wire, ground, and signal wire. The 4 wire setup has two heater wires. I don't believe they make a two wire o2 connector because it wouldn't have a heating element or signal wire, has to have ground.

Posted on Sep 05, 2010

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P1152 Mustang 2000 GT 4.6 2v 5spd


Going to suggest a few things. Since each side has an identical O2, just switch 1 bank's O2 for the other and see what happens. Maybe replacement part was bad.

Also want to add that wiring of the heater on O2 sensor is not always electrical. Some O2 sensors have hollow wire for heat venting. You say that the shop rewired ECU to O2 but must have used solid core wire to do it. This will not work if you needed a hollow core wire from the O2.

Sep 04, 2012 | Ford Mustang Cars & Trucks

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2000 Pontiac sunfire 2.2 got code 1137. How do I fix. Car won't start. I changed o2 sensor.


The 1137 OBD2 code is typically an o2 sensor problem as you have indicated, first I would make sure your replacing the correct o2 sensor as there are two (upstream and downstream), although it is possible that a bad o2 sensor could keep your engines fuel injection system from delivering the fuel to your engine, in my experience having a bad sensor typically results in a check engine light and running with a less than optimum fuel air mixture, it does not typically keep your vehicle from starting. If your still getting the 1137 error code after replace the o2 sensor and checking its connecting wires I would start looking for a bigger issue.

May 16, 2012 | 2000 Pontiac Sunfire

1 Answer

O2 sensors wiring diagrams


Locate the wires running off from the O2 sensor. There should be two. The black wire is the ground wire. The other wire, which may vary in color, supplies power to the sensor.

  • 2 Connect the power lead to the corresponding connector on the chassis's wiring harness.
  • 3 Connect the black, or ground, lead to the corresponding connector on the factory wiring harness.
  • 3 wires, "how do i wire it" are simply explained. all universal 3 wire o2 sensors will have 2 wires one color, the other wire a different color. the 2 that are the same color are ground and power for the heater and it doens't matter which one is which. so ground to the motor, power from the gray wire on the fuel pump, or anywhere you want to pull 12 volts while the car is running. i have a dedicated fan relay that doesn't use the ecm and runs off the key, so thats where i went. the different color wire goes to the stock sensor wire, it's the signal.


  • Dec 04, 2011 | 1989 GMC K3500

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    Hi-Failed inspection at Motor Vehicle Code PO160 (2001 Nissan Maxima). Car runs fine- no dash lights on. Left Rear Oxygen Sensor? Cost to fix or rigg it? Must get this car passed. Thanks in advance,...


    CausesPotential causes of an P0160 code include:
    • Holes in exhaust near post cat o2 sensor
    • Bad Bank 2, position 2, o2 sensor
    • Wiring problem, melted harness, broken connectors, etc.
    • Bad PCM
    Possible SolutionsIt's always best to do a visual inspection of the exhaust system first. Look for holes near o2 sensors or wiring harnesses coming in contact with exhaust components. Repair as necessary.
    1. Start the engine and allow it to reach operating temperature. Using a scan tool, observe the Bank 2 position 2 o2 sensor. If it isn't moving at all this doesn't necessarily mean that anythings wrong. Post cat o2 sensors often switch very little. Increase the engine RPM to a fast idle and then recheck the sensor voltage reading. If it starts switching now, the sensor may be sluggish and/or intermittently going "dormant". Replacing the sensor at this point would be a good idea. Visually check the o2 sensor for contaminates, etc. If you suspect it's contaminated with coolant or oil, replace it. But, if it still isn't responding after increasing engine RPM, turn off the engine and unplug the 2/2 o2 sensor. With KOEO (key on engine off) check that there is 12 Volts battery voltage and a good ground to the o2 sensor heater element. If the heater element has no battery voltage it can cause the o2 sensor to be sluggish and not switch properly which can cause a P0160.
    So, diagnose that problem first(there will usually be other codes present). If there is power and ground to the heater element check that the sensor ground is present. If it is, connect a jumper wire between the sensor ground and signal wire. Now the 2/2 o2 sensor reading should be low. If so, replace the Bank 2 position 2 o2 sensor. If, after connecting the jumper wire, the o2 sensor reading still remains "stuck", check for wiring problems, harness contacting exhaust components, or broken connectors. Repair as necessary. Then recheck. If you can find no wiring problems and the o2 sensor reading on the scan tool doesn't change after installing the jumper wire, recheck at the PCM connector. It may be necessary to clip the signal wire near the PCM in a location that will be easy to repair. If it now shows a low voltage reading, then you know beyond a doubt that there is a wiring problem. At this point clipping the offending wire out of the harness and running a new one may be your best bet. But If it still shows no change, the PCM may be at fault.

    May 14, 2011 | Nissan Maxima Cars & Trucks

    1 Answer

    1996 4 runner had p0171 repair o2 sensor and exhaust leak rd test mil light came on p0325,p0330.knock sensor codes circuit codes banks 1,and 2.replace knock sensor harness under manifold sensor visual look...


    what is the resistance of the wires between sensor and ecm connector, excess resistance from varying gauge wire and solder or solder-less connections can cause problems

    Mar 10, 2011 | 1994 Toyota 4Runner

    1 Answer

    CODE PO155 BANK2 SENSOR 1 WHERE IS THIS SENSOR LOCATED?


    A code P0155 may mean that 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
    * Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)


    Oxygen sensors are always numbered like this:
    Bank 1 sensor 1
    Bank 2 sensor 1
    Bank 1 sensor 2
    Bank 2 sensor 2

    Some manufacturers use a kind of shorthand that reads different, but means the same thing:
    Sensor 1/1 or O2s 1/1
    Sensor 2/1 or O2s 2/1
    Sensor 1/2 or O2s 1/2
    Sensor 2/2 or O2s 2/2

    Bank 1 is always the side of the engine where cylinder number 1 is located and, of coarse, Bank 2 is the opposite side.
    On a 4 cylinder engine, there is only 1 bank and it is always referred to as Bank 1.

    Sensor 1 is always the upstream sensor (The one located BEFORE the catalytic converter)
    Sensor 2 is always the downstream sensor (the one that is located AFTER the catalytic converter.

    Hope helps (remember to rate this).

    Oct 02, 2010 | 2002 Mitsubishi Montero

    1 Answer

    Where Are The sensor Banks On The 2004 GC


    Grand Cherokee oxygen sensor locations for 4.0 and 4.7 engines

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    Four wires (circuits) are used on each O2 sensor:

    • 12–volt feed circuit for the sensor heating element
    • Ground circuit for the heater element
    • Low-noise sensor return circuit to the PCM
    • Input circuit from the sensor back to the PCM to detect sensor operation

    O2S Sensor removal Never apply any type of grease to the oxygen sensor electrical connector, or attempt any soldering of the sensor wiring harness.
    WARNING: THE EXHAUST MANIFOLD, EXHAUST PIPES AND CATALYTIC CONVERTER(S) BECOME VERY HOT DURING ENGINE OPERATION. ALLOW ENGINE TO COOL BEFORE REMOVING OXYGEN SENSOR.
    1. Raise and support vehicle.
    2. Disconnect O2S pigtail harness from main wiring harness.
    3. If equipped, disconnect sensor wire harness mounting clips from engine or body.
    CAUTION: When disconnecting sensor electrical connector, do not pull directly on wire going into sensor.
    4. Remove O2S sensor with an oxygen sensor removal and installation tool.

    02S Sensor installation
    Threads of new oxygen sensors are factory coated with anti-seize compound to aid in removal. DO NOT add any additional anti-seize compound to threads of a new oxygen sensor.
    1. Install O2S sensor. Tighten to 22 ft. lbs. (30 N·m) torque.
    2. Connect O2S sensor wire connector to main wiring harness.
    3. If equipped, connect sensor wire harness mounting clips to engine or body. When Equipped: The O2S pigtail harness must be clipped and/or bolted back to their original positions on engine or body to prevent mechanical damage to wiring.


    Hope thats help (remember comment and rated this).

    Apr 29, 2010 | 2004 Jeep Grand Cherokee

    1 Answer

    2000 sunfire loose sensor wire off the alternator wireing harness 2.2L, car when it starts runs for a wile then cuts off, the wire extends about 12 inches down from alternator. where to I do not know.


    large cable wire should run to battery or starter smaller wire would be to gauge or exciter wire (voltage must be sent to alt. before it can begin charging) either way wire should run in to harness try a haynes manual found at auto zone $22.00 lock in chapter 12 for wiring schamitic find alt it will show color of wires coming from alt. wat they are for and where they should go

    Feb 16, 2010 | 2000 Pontiac Sunfire

    1 Answer

    2000 sk8 with trouble code 1647


    The DTC code P1647 indicates that there is a issue with the O2 sensor bank 2 upstream. What caused the code could be a heater failure to the O2, Sensing circuit failure (Short circuit to ground, short circuit to hight voltage, or open circuit). Last would be ECM failure but that's rare. The Bank 2 is the radiator side, check the wire harness to the O2, The harness to both upstream and downstream O2 sensor are connected to a bracket in front and below the battery. Look for corrosion and follow the harness for any breaks that would cause a short in the system. Also check the fuse to the O2 sensor heaters, not sure which fuse it is but check all the fuses in the fuse box under the hood. If everything is ok then most likely the O2 sensor needs to be replaced. Good luck and hope this helps.

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