Check Engine light

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Aug 27, 2006 | 07:42 PM

TURBOJ

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Joined: Aug 2006

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From: Hawaii

Check Engine light

I pulled a code 41 (Primary o2 sensor)from my 2000 civic. My question is which one is the primary? I have two on this car, the top or the bottom one.
TIA

Aug 27, 2006 | 07:54 PM

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From: A forum with actual tech

The one before the cat.

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