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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 02-15-2005, 06:07 PM   #1
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Default o2 replacement

I'm doing a tune up on my car and need to replace the o2 sensor, but someone told me that there are two o2 sensors on the car. I was wondering if a.) there are two and b.) if I should replace one of them and where they are located.
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Old 02-15-2005, 06:10 PM   #2
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Only the front o2 sensor needs to be replaced, the other one simply measures if the cat is still there.
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Old 02-15-2005, 06:13 PM   #3
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Thanks, and could anyone confirm this part number is correct for a 95' GM# 25312184
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Old 02-15-2005, 08:52 PM   #4
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Old 02-17-2005, 10:40 PM   #5
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I am trying to change mines too.
Where is the O2 sensor located in a 94 bonneville?
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Old 02-17-2005, 11:41 PM   #6
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“you will see a large body spark plug looking dooHickey with 4 wires, that will be the O2... “

This is a description of an O2 Sensor even I can visualize.
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