90K 06 Honda Accord LX SE - Check Engine Light Went On

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Aug 7, 2012 | 08:55 AM

#21

sc30317

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Joined: Jun 2012

Posts: 9

redbull-1,

I think you are talking about the secondary sensor? I need to replace the primary sensor?

Aug 7, 2012 | 09:05 AM

#22

redbull-1

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Joined: Oct 2010

Posts: 7,099

From: United States

That is the primary sensor for the four cylinder. The four cylinder has the air/fuel ratio (primary) sensor before the cat and the secondary O2 sensor at the cat.

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