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  1. Bad knocking/sloshing sound

    9-5 Workshop
    I started my 2001 Saab 9-5 V6 this morning and it turns out it has a very loud knocking/sloshing sound. I had things to do so I drove it anyway. It has not decreased my performance any, which is surprising. I have a bad O2 sensor but that shouldn't cause a knock as far as I know. :x Any Ideas?
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