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o2 sensor

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Old 11-23-2004, 09:54 AM
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Default o2 sensor

newbie question......i know for a 99si it has 2 o2 sensors one of them is on or by the CAT wheres the other one???
Old 11-23-2004, 09:56 AM
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in the header, right before the cat
Old 11-23-2004, 09:57 AM
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Default Re: o2 sensor (dylokjai)

Might want to take a look at the Header and the cat. However, my setup has both on the header itself.. Dunno if thats correct or not, but the last o2 is b4 the cat...

Hope it helps
Old 11-23-2004, 11:11 AM
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Default Re: o2 sensor (dylokjai)

yes your secondary o2 sensor is either after the cat or in the cat. your probibly having trouble seeing your primary o2 sensor because you may still have the stock heat shield on the header.
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