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O2 sensor wiring

2003mod pt.
4wires from o2 sensor
black, white, white, and grey/lightblue
question is (which is what) out of these wires??
guess black is ground, but the rest??

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  • violataz Sep 10, 2008

    Cause i bought this performance-tuning ajustable chip. That needs connecting to the IAT sensor and both of the O2 sensors.. So I needed to know which of the wires is the signalwire..?..
    Both O2 sensors have 4 wires (two whites,grey and black)
    And IAT sensor has just one red and one black??? Thank you soooo much


  • shaggy3119
    shaggy3119 Nov 26, 2008

    I tested the 4 cables the 2 white 1 black 1 gray.
    Black 4.32v voltage to 3.45v
    1 white 5.8v to 5.5V
    the other white 0.3v to 0.4v
    gray 0.0v


    outo zone and ask the attendant if he knew which wire sent signal to the computer, he showed me a sensor of Bosh and show that, the black send signal to the computer ..
    and both white is the hitter,
    grey is the ground .....
    with doubts?


    I bought an air / fuel ratio gauge it goes into lean .....
    I do not know what to do?

  • Daniel Jenkins
    Daniel Jenkins May 11, 2010

    Use a voltmeter to test.



    Why do you need to know which wire is which anyways?

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2 Suggested Answers

  • 615 Answers

SOURCE: '05 PT Cruiser O2 sensor problems.

I had a similar problem with my car. It turned out the O2 sensors were fine and the issue was a leak in the throttle body causing the engine to run lean. If you have an ODB2 scanner you can look at fuel trims, etc and will be able to tell.

Posted on Mar 28, 2010

  • 2309 Answers

SOURCE: 06 pt crusier replaced both o2 sensor and still

the fact that you replaced the sensor and the same code is there means the sensor is functioning ok, you have another problem, code readers just tell you what caused the mil light to go on, not the problem, for that you have to scan the engine on a reader and get readings from sensors and actuators, it could be a plug, vacuum leak egr malfunction, injector malfunctioon to name a few, do yourself a favor and get the engine analysed

Posted on Nov 25, 2010

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