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O2 Sensor Circuit Voltage Low - X12XE - Op Com Live data conclusion

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  • [Corsa B 1993-2000] O2 Sensor Circuit Voltage Low - X12XE - Op Com Live data conclusion

    Accelerating Hard will light up the EML and put the car into limp mode. Easing off the gas and the EML switches off and car goes back to normal driving mode.

    The 1 Fault Code is: P0130 O2 Sensor Circuit Voltage Low

    The O2 Sensor is getting 12.7 volts OK with IGN on.

    Opcom Live data for the O2 Sensor at Idle rpm for 10seconds is (O2 sensor loop = closed all the time):

    O2 Sensor mV
    117
    156
    498
    722
    732
    717
    698
    649
    532
    127
    88
    102
    166
    390
    712
    732
    702
    561
    210
    98
    141
    493
    712
    688
    654
    459
    112
    98
    107
    234
    717

    That seems all over the place. The Desired Idle Air is 15 and Actual is 8 kg/h. That seems to be a big gap at idle. What could that be down to?

    I also recorded live data while gradually increasing revs up to about 4k RPM and then letting back down to idle and got this data:

    Time Engine Speed O2 Sensor O2 Sensor Loop
    sec RPM mV
    0.19 960 63 Closed
    0.53 960 63 Closed
    0.86 960 63 Closed
    1.2 960 63 Closed
    1.53 960 63 Closed
    1.88 960 63 Closed
    2.21 960 63 Closed
    2.54 960 63 Closed
    2.88 960 63 Closed
    3.22 960 63 Closed
    3.55 960 63 Closed
    3.89 960 63 Closed
    4.22 960 63 Closed
    4.56 960 59 Closed
    4.89 1.2 34 Closed
    5.23 1.6 34 Closed
    5.56 1.92 39 Closed
    5.9 2.12 39 Closed
    6.23 2.24 39 Closed
    6.55 2.32 39 Closed
    6.9 2.4 39 Closed
    7.23 2.48 39 Closed
    7.56 2.56 44 Closed
    7.89 2.68 39 Closed
    8.22 2.8 34 Closed
    8.56 2.96 29 Closed
    8.9 3.12 29 Closed
    9.23 3.32 29 Closed
    9.57 3.56 29 Closed
    9.9 3.76 29 Closed
    10.24 3.68 54 Closed
    10.57 3.56 44 Closed
    10.91 3.48 39 Closed
    11.24 3.84 24 Closed
    11.58 4.28 29 Closed
    11.91 3.92 810 Closed
    12.24 3.44 54 Closed
    12.57 2.96 507 Open
    12.91 2.36 5 Open
    13.24 1.8 0 Open
    13.59 1.28 0 Open
    13.93 1.04 0 Closed
    14.26 1 10 Closed
    14.59 1 20 Closed
    14.92 960 24 Closed
    15.26 960 29 Closed
    15.59 960 29 Closed
    15.94 960 29 Closed
    16.27 960 29 Closed
    16.61 960 29 Closed
    16.95 960 29 Closed
    17.29 960 34 Closed
    17.62 960 34 Closed
    17.95 960 34 Closed
    The O2 sensor wiring sits right next to the exhaust, and the heat shield doesn't provide much protection. I think the wiring might be toasted. Either way it looks like time to replace the O2 Sensor.
    Do you guys agree?

  • #2
    The sensor when warm ought to run most of the time in closed loop - you're looking for a rapid switch between lean / rich on idle, and remember that on open throttle settings the ECU will ignore O2 readings to allow the engine to produce maximum power.

    Also, since the O2 system is a feedback system faults shown by it may actually be indicating problems elsewhere - eg if your aiflow metering is out then the fuel mix will be wrong and the O2 sensor will be throwing a code for that reason.

    Having said that they don't last forever. But always double check before assuming it's the O2 sensor itself.

    You may find this worth reading through Oxygen Sensor Information
    1972 Viva restoration thread - http://www.thecorsa.co.uk/projects-b....html#post1534

    Comment


    • #3
      Thanks for the link Taurus, I see now how it measures and reports volts.

      Would you or anyone else reading have a Live Data fie of a good running Corsa Idling fine?

      Corsa B 1.2 X12XE per chance?

      I'd like to compare these Live Data results that I have (file links below):

      1. Live Data to 1st test at Idle
      https://drive.google.com/file/d/0B_1...it?usp=sharing

      2. Live Data to 2nd test with engine revs up to 4k and then back down to idle
      https://drive.google.com/file/d/0B_1...it?usp=sharing

      3. Live data to 3rd test at Idle, after a 15 min drive....(after cooling fan cycle)
      https://drive.google.com/file/d/0B_1...it?usp=sharing
      Here I can see a constant lower voltage of between 70 an 90mV, which is 0.07 to 0.09Volts. Much different to the results of Idle Test 1 above.
      I have read that some have had a cracked catalytic converter that pulls O2 into the internal sensor pickup. That may explain it, apart from the chance that the O2 sensor is knackered. I've ordered a Bosch O2 sensor anyway, and am looking forward to the propane torch test mentioned in your link above and displayed here


      Hopefully sharing this type of information may be useful for others. I've put my engine spec in this post, but I can't for the life of me find out where to update my signature? How did you get there?
      Cheers =]
      Last edited by del75; 20-01-2014, 03:22 PM.

      Comment


      • #4
        There is an Opcom users' website with examples of data on them. I've never recorded any myself though.

        To edit your signature look under the settings tab - top right of the screen - I think.

        Re. the links above - do I have to download those files to see them?
        1972 Viva restoration thread - http://www.thecorsa.co.uk/projects-b....html#post1534

        Comment


        • #5
          Ok thanks for that tip, I'll download and have a look at the page from the opcom users forum.

          Yes when I tried the live preview, google said the page was too large, and was missing most of the data.

          However, here are links to images that you should be able to preview without download:

          1. Live Data to 1st test at Idle
          https://drive.google.com/file/d/0B_1...it?usp=sharing

          2. Live Data to 2nd test with engine revs up to 4k and then back down to idle
          https://drive.google.com/file/d/0B_1...it?usp=sharing

          3. Live data to 3rd test at Idle, after a 15 min drive....(after cooling fan cycle)
          https://drive.google.com/file/d/0B_1...it?usp=sharing


          After comparing with a file from a good running corsa-b from the opcom users site, I can see where the O2 sensor should be switching between lean and rich, and going up to much higher mV readings than in my 3rd idle test on closed throttle.

          Comment


          • #6
            [Corsa B] O2 Sensor Circuit Voltage Low - X12XE - Op Com Live data conclusion SOLVED

            Desired and Actual Air Idle was the clue as there was a big gap.
            Opcom users forum was a good tip taurus, thank you.
            Put a new bosch MAF sensor on, (air filter and plugs) and it's running sweet. Nice.

            Comment

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