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OBDII code PO133 850 1995

posted by  fauteux on  Thu Jul 14 05:11 CST 2005
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last visit: Sun Mar 8 11:57 CST 2009
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I got a PO133 code a couple of times on my 95 850 with 144k miles. I understood that to indicate that the number 1 O2 sensor was gone, i.e. the one closer to the front. I replaced it. Now, a couple of hundred miles later, the same code has appeared. Any thoughts? Did I replace the wrong sensor?








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    OBDII code PO133 850 1995

    posted by  M_volvo850 on  Thu Jul 14 13:26 CST 2005
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    Well,

    It's a pain with these O2 sensors sometime...first of all what brand did you use?
    Should be Bosch or original Volvo O2 sensor..my mechanic was telling me ..that if you don't a Volvo computer ....you can't clear well the O2 codes ...
    Maybe you should find first a Volvo mechanic to clear the code and to see if the O2 sensor works ....yu should see on the computer the signal in mV (should be under 1V) and changing values prety fast...
    Another thing if the front one was gone it is very possible that you have to change the rear one too...

    Well I have this problem more than one month now ...I've changed both O2 sensors and I still have the light on .. But in my case I have my CCs broken .... and I have to replace it and I will see after ...

    Good luck...






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