How do i check for a faulty o2 sensor? - Page 2 - 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 05-08-2003, 11:54 PM   #11
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jeffrey10x2,

I stand corrected. Yes, it is AC. Had a brain fart!
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Old 05-09-2003, 10:00 PM   #12
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Default thanks guys !

I thought my question wasnt answered .Im gonna have to start watching the threads I guess!Thanks for the info guys .I'll wait until death rat can get some prices on the o2'*.
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Old 05-10-2003, 05:21 PM   #13
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Jeffrey10x2,

Just checked back into my ALLDATA CDRom on my '92 to verify just what the procedure really is to check the O2 sensor. It DOES say to use the DC scale, NOT the AC scale. Ground one v-ohm meter terminal, attach + DC side of meter to o2 termineal, with wire disconnected. Manually create vacuum leak and/or introduce propane into intake and check your DC readings. Will fluctuate from about .1vdc to .9vdc.

When I used AC scale I can not get a stable reading. When I use my ocilloscope on AC scale I get too much interference; again the DC scale on the ocillo works.

The fact that YOU are taking a reading downstream with the sending wire connected may just call for that AC reading, but my manual does not cover that procedure.
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Old 05-10-2003, 07:05 PM   #14
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If there are deposits on the o2 sensor is there a safe way to clean them off, perhaps preventing buying a new one?
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