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99 v70 Heated O2

posted by  stonybrook on  Sun Mar 12 13:19 CST 2017
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last visit: Sat Sep 6 12:30 CST 2014
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I get a CEL indicating Heated O2 not working. I removed the O2 sensor and found an open circut across the heater wires. If I jiggled the wires where they enter the sensor I could get a random and intermittent Ohm Reading. I bought a new sensor with the proper reading, but I still have the same CEL Code even after replacement. Any Idea?








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    99 v70 Heated O2

    posted by  KlausC on  Sun Mar 12 18:32 CST 2017
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    last visit: Fri Oct 24 10:15 CST 2014
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    Did you clear the O2 code? If not, it could take a couple of cycles to go out on its own.

    I hope you bought a plug compatible O2 sensor.
    --
    Keeping it running is better than buying new








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      99 v70 Heated O2

      posted by  stonybrook on  Mon Mar 13 03:49 CST 2017
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      last visit: Sat Sep 6 12:30 CST 2014
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      Volvo O2 sensor, same Part #, I cleared the code by disconnecting the Bat, It was off for about 5 miles, came back on same code P0135. The other Sensor was clearly bad, but this one tests out OK.








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        99 v70 Heated O2

        posted by  KlausC on  Mon Mar 13 09:49 CST 2017
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        last visit: Fri Oct 24 10:15 CST 2014
        [RELATED]

        I know this isn't fun, but you might want to spray the plug connectors with a cleaner and ensure that the male pins haven't retracted. Measuring the resistance between the 2 black wires should result in less than 2 Ohms but not zero. If it is greater than 2 Ohms, send it back and get a replacement.

        There can be a lot of sand, grit on the connector that needs to be carefully cleaned off.


        --
        Keeping it running is better than buying new







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