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I have test pipes and a borla TD and after I installed them my check engine light came on and there was a rattle. The rattle ended up being one of the O2 sensors which is broken or something is loose inside and that also may be why the check engin light came on. I need to know if an O2 sim completely replaces the O2 sensor or attaches to it etc. I would also like to know how much they cost and where to get them. Thanks.