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.

O2 Sensor

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Old 05-12-2006, 07:53 PM
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My mileage has dropped a few points lately, from 25 to 23 highway, so I pulled mine out.

Good, bad, or ugly? (140,000 miles)


I also regapped my plugs. The front bank was up to .066 but the rear bank was all at 061 or 062. They might still be original but they all still look good.
Old 05-12-2006, 09:06 PM
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With 140k miles, you got at least 60k more than you should out of it. Without a doubt replace it!
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