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1997 chevy Blazer 4.3 vortec 4×4 post cat O2 sensor problem

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  • July 20, 2012 at 11:00 am #458850
    moparfanmoparfan
    Participant

      have you checked for power and ground to the 02 sensor heater?

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    • July 20, 2012 at 11:00 am #458851
      college mancollege man
      Moderator

        can you post the actual code that was read?

        July 20, 2012 at 11:00 am #458852
        EricTheCarGuy 1EricTheCarGuy
        Keymaster

          Yea what’s the code?

          July 20, 2012 at 11:00 am #458853
          dreamer2355dreamer2355
          Participant

            Welcome to the forums and +1 on the code number for us to help you more C8-)

            July 20, 2012 at 11:00 am #458854
            MattMatt
            Participant

              Well, I agree, the code is much needed here.

              July 21, 2012 at 11:00 am #458855
              chevymann106chevymann106
              Participant

                [quote]Quoted From Beefy: _x000D_
                _x000D_
                Well, I agree, the code is much needed here.

                July 21, 2012 at 11:00 am #458856
                chevymann106chevymann106
                Participant

                  [quote]Quoted From moparfan: _x000D_
                  _x000D_
                  have you checked for power and ground to the 02 sensor heater?

                  July 21, 2012 at 11:00 am #458857
                  dreamer2355dreamer2355
                  Participant

                    A DVOM will not be able to update quick enough, Your best bet is a scope or graphing meter for your o2 sensor readings.

                    July 21, 2012 at 11:00 am #458858
                    moparfanmoparfan
                    Participant

                      like stated above you will need a graphing meter or a scope to do a good test on the 02 sensor. it will be much faster with the CEL code.

                      July 21, 2012 at 11:00 am #458859
                      MattMatt
                      Participant

                        Since you say you’ve replaced the sensor 3 times, and all the exhaust, then the next step is to inspect the wiring to the sensor itself.

                        July 22, 2012 at 11:00 am #458862
                        college mancollege man
                        Moderator

                          heres a link for a little trouble shooting_x000D_
                          _x000D_
                          _x000D_
                          _x000D_
                          http://www.obd-codes.com/p0146

                          July 22, 2012 at 11:00 am #458863
                          chevymann106chevymann106
                          Participant

                            Thanks for the link i will check tomorrow and see how things turn out. I will repost the results around the same time thanks again

                            July 22, 2012 at 11:00 am #458860
                            chevymann106chevymann106
                            Participant

                              So i got the truck scanned and the code came up P0146 Bank 1 sensor 3 HO2S an according to alldata this DTC pops up when the vehicle control module detects no HO2S activity, Any ideas on where to go from here?

                              July 22, 2012 at 11:00 am #458861
                              rice400rice400
                              Participant

                                check the wiring integrity all the way back to the PCM

                                July 23, 2012 at 11:00 am #458864
                                EricTheCarGuy 1EricTheCarGuy
                                Keymaster

                                  Since you’ve replaced the sensor without result I would check the wiring all the way back to the computer, you could have a wire or connector problem somewhere.

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