Thread: Replacing O2
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      03-28-2014, 08:58 PM   #3
DKZTT
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Drives: BMW Z 35i
Join Date: Jul 2013
Location: ATX

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No, I have been running the downpipes for awhile(almost 4 months). I am positive I didn't switch them. I am currently running an aggressive tune, so it's possible with the high boost the sensors would go out before it's time to change them.

Only the two upstreams are bad, I decided to just go ahead and change all four of them at the same time.
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