O2 Sensor - 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 06-30-2005, 08:12 PM   #1
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Default O2 Sensor

What exactly does it do?
Why does it affect gas mileage?
Can you tell if the engines running lean by looking at an old one?
Should i reset the PCM after installing the new one?
Thx in advance
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Old 07-01-2005, 07:33 AM   #2
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It measures the amount of oxygen in the exhaust air to compute the A/F ratio.

Because if it fails lean, the PCM will richen the engine to no end.

Somewhat, But not reliably.

Yes.
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Old 07-01-2005, 08:22 AM   #3
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Thx Dame
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