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02 sensor issue.

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    #1

    02 sensor issue.

    Okay, so i replaced my 02 sensor with an ngk sensor. The guy that previosly owned this car had cut off both connecters. One from wiring harness on car and one from 02 sensor and reversed them for some reason. After fixing it back to normal my cel came off but only for a little while. If i turn my car off and back on it will take about 20 minutes than the cel will come back on Just like clock work. Why is this happening?

    MRT>http://www.cb7tuner.com/vbb/showthre...70#post3021770
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    #2
    Originally posted by Twest7740 View Post
    Okay, so i replaced my 02 sensor with an ngk sensor. The guy that previosly owned this car had cut off both connecters. One from wiring harness on car and one from 02 sensor and reversed them for some reason. After fixing it back to normal my cel came off but only for a little while. If i turn my car off and back on it will take about 20 minutes than the cel will come back on Just like clock work. Why is this happening?
    What code?
    And did you wire it correctly?


    Car Safety / General Servicing Checks --------Basic suspension checks

    My 5.7 LS1 Holden Ute

    A "Finished" project car is never finished until its been sold.

    If at first you don't succeed, Try again. Don't give up too easily, persistance pays off in the end.

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      #3
      Originally posted by evil_demon_01 View Post
      What code?
      And did you wire it correctly?
      Code 41. And yeah. It works for like twenty minutes than if i restart the car It goes away for another 20 minutes.

      MRT>http://www.cb7tuner.com/vbb/showthre...70#post3021770

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        #4
        The ECU doesn't use o2 sensor feedback while the engine is warming up. That's why it feels like it's working correctly. It's not being used at all!

        It's possible that the sensor you got is faulty... but it's more likely that the splicing done by the previous owner (and now by you out of necessity) has caused a change in resistance in the wires, causing the o2 sensor's signal to be read incorrectly.






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          #5
          What wires did you used? Did you get the wires from the OEM junk yard with the connector on it? That is the best. Did you test the resistant on the O2 sensor to see if it is defective?
          O2 Sensor Test

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            #6
            Originally posted by deevergote View Post
            The ECU doesn't use o2 sensor feedback while the engine is warming up. That's why it feels like it's working correctly. It's not being used at all!

            It's possible that the sensor you got is faulty... but it's more likely that the splicing done by the previous owner (and now by you out of necessity) has caused a change in resistance in the wires, causing the o2 sensor's signal to be read incorrectly.
            Okay. So how could i fix that? because those wires i believe just run straight into the engine wiring harness.

            MRT>http://www.cb7tuner.com/vbb/showthre...70#post3021770

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              #7
              Originally posted by Bad_dude View Post
              What wires did you used? Did you get the wires from the OEM junk yard with the connector on it? That is the best. Did you test the resistant on the O2 sensor to see if it is defective?
              O2 Sensor Test
              I pulled the 02 sensor from the jy and it had the conector on it. so i left that. Since the previous owner had them reversed i used the one he had conected to the 02 sensor and rewired the to the car harness returning it to oem. I didnt use and other wire that was never on the car before.

              MRT>http://www.cb7tuner.com/vbb/showthre...70#post3021770

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                #8
                Originally posted by Twest7740 View Post
                I pulled the 02 sensor from the jy and it had the conector on it. so i left that. Since the previous owner had them reversed i used the one he had conected to the 02 sensor and rewired the to the car harness returning it to oem. I didnt use and other wire that was never on the car before.
                Did you follow the link I gave you to test your O2 sensor, the wiring in between and your ECU? That's a good DIY steps to narrow things down to the bone, sorta.
                Let us know what you find.

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