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Thread: hg blown ? about O2's

  1. #1
    Join Date
    Oct 2006
    Location
    48125,michigan
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    4,186

    Exclamation hg blown ? about O2's

    this was a while back but i blown my head gaskets and wondering when this happens will it mess up the o2's or cats the car was parked soon as hg's went

  2. #2
    Join Date
    Feb 2006
    Posts
    1,964
    I've seen the O2 sensors wiped out by the coolant before.

  3. #3
    Join Date
    Oct 2006
    Location
    48125,michigan
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    4,186
    i know it possable but dose it happen alot i put like 2 miles with blown hg's

  4. #4
    Join Date
    Feb 2006
    Posts
    1,964
    I have done many head gaskets on 3.8 engines, and if enough coolant gets on the sensor it will kill it.

  5. #5
    I have changed headgaskets on three SCs and haven't had to change O2 sensors. On my 89 SC the O2s only had 3000 miles on them so I didn't change them when the HG blew. That was in 2003 and O2s still working fine as I got 25.3 MPG on the trip to the Shootout. If you don't get any codes afterwads I would say they are okay.


    Jerry

  6. #6
    Join Date
    Apr 2002
    Location
    Overland Park, KS
    Posts
    4,061
    I'd say repair the HG and drive it. You will know soon enough if the O2's were damaged.

    Thomas

  7. #7
    Join Date
    Jun 2002
    Location
    Orem, UT
    Posts
    5,902
    I didn't change my O2 sensors after my head gasket job either. I took them out and cleaned them with electrical parts cleaner, and then cut off the cats and had new downtubes made and re-used the sensors. I'm sure they could be replaced and I might see better gas mileage, but I have no codes.

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