Question about 2003 GMC Sierra 1500

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Oxygen sensors I have a GMC sierra 1500 HD 2wd. I am try to wire in some EFIE's into my oxygen sensors to allow my hydrogen generator work on my truck. I need to know which of the four wires on my oxygen sensors is the "highside signal wire". Can you please help.

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You have four on this truck. bank one sensor one is "black and white" b1 s2 "brown" b2s1 "light green" b2 s2 "red/white" good luck post as fixed thanks

Posted on Sep 20, 2008

  • Jimmy
    Jimmy Sep 20, 2008

    purple is the high signal on both o2 sensors tan is the low side others are heater circuits

  • Jimmy
    Jimmy Sep 20, 2008

    no prob your welcome

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Hello gobabygo1, my name is JShreader. Thank you for choosing fixya.com.

There is 4 Oxygen Sensors on this model Truck. I uploaded a picture showing you exactly where each of the 4 Oxygen Sensors are located. It is in .pdf format. You can download it by clicking HERE. I hope this helps you. If you have any more questions or need any more diagrams, please don't hesitate to ask...Thanks again, JShreader!

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