*Before or after* - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 01-13-2004, 12:51 PM   #1
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I was at Autozone and the O2sensor that I was going to buy they were asking me if I needed the one before the cat or after the cat......how can I tell which one I need?
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Old 01-13-2004, 01:29 PM   #2
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The one in front of the cat is usually the one that goes so I would almost gaurentee thats the one you need.
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Old 01-13-2004, 01:58 PM   #3
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cool....thanks
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Old 01-13-2004, 02:32 PM   #4
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Wait don't buy it from autozone.

They have Bocsh parts, go with AC Delco off of gmpartsdirect.com or the dealer if you have to. Bocsh parts seem to have lots of problems with our cars. They don't last very long.
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Old 01-13-2004, 02:42 PM   #5
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Agreed. Don't count on a Bosch O2 lasting longer than 3 months.

The O2 in your rear exhaust manifold is the one that can affect your fuel mileage. The O2 after the Catalytic Converter is simply there for emissions purposes, to make sure the Cat is doing it'* job. It can have no effect on driveability or mileage.
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Old 01-13-2004, 03:35 PM   #6
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Alrighty....guess I'll scratch my autozone trip off the list today......
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