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O2 sensor after catpaulfischer 06-01-2005, 08:30 AM was wondering what the O2 sensor behind cat regulates. 99 LTZ with 3.8. 118,000 miles. I replaced the one before cat, and was wondering if the one after it should be replaced. I've heard people say yes and no on the subject. Thanks vBulletin®, Copyright ©2009, Jelsoft Enterprises Ltd.
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