Need O2 Sensor help - 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 03-21-2003, 10:26 PM   #1
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Default Need O2 Sensor help

OK,My service engine soon light came on this week.My wife took it to Advance Auto to get the code read.He told her it was the O2 sensor.I've noticed that shes not running as good as it needs to be.Now I called about a new one tonight and he asked which one .The one on the manifold or not.They have the one for the manifold at $69.00.The O2 sensor I,m familiar with is on the tube behind the air filter.Which one do I need? Thanks SO CLEAN ONE.
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Old 03-21-2003, 10:58 PM   #2
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You should put what year and stuff in your sig. It'* will be the one be hind the engine on the manifold, there isn't one on the airbox or around it. The other one is on the CAT or near it I think. Someone will tell me if I'm wrong.
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Old 03-21-2003, 11:00 PM   #3
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the one by the air filter is the IAT sensor (intake air temperature sensor). Is your car a pre 95 car? Or is it a 95-2004? If it is a pre 95, then you only have one oxygen sensor on the exhaust manifold which should cost around $20 at a store like autozone. BUT if your car is 95 or newer, the O2 sensor Before the cat on the manifold will be around 60, and there is also an O2 sensor after the converter..
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Old 03-21-2003, 11:01 PM   #4
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Well I wasn't too wrong, I know my car has 2 but I don't know if his does.
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Old 03-21-2003, 11:31 PM   #5
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Default O2 Sensor help

My SLE is a 98.OK So thats not the O2 sensor on the tube behind the air filter box.Well what does the O2 sensor look like and where exactly is this thing?
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Old 03-21-2003, 11:42 PM   #6
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It'* on the back of the engine on the exhaust manifold. Look at your spark plugs on the back of the engine and on the 2nd one from the left and look down on the exhaust manifold will be your O2 sensor. It'* like 3 inches long with 4 wires on it and on the bottom of it looks like a bolt to take it out. It'* real easy to find.
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Old 03-21-2003, 11:58 PM   #7
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Default O2 Sensor help

OK Thanks alot.Now one more thing.How easy is it to replace.And is this the one thats priced around 60 to70 bucks?
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Old 03-22-2003, 12:00 AM   #8
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Yes it'* not cheap, but at GM Parts Direct you can get it for 35 bucks. I don't know how to replace it, I've never taken it out yet, but it just looks like it screws out by using a wrech or pliers. Others will know here.
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Old 03-22-2003, 01:07 AM   #9
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Crescent wrench. Backyard mechanic job. Part numbers up in Techinfo.
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Old 03-22-2003, 01:48 PM   #10
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Quote:
Originally Posted by Custom88
the one by the air filter is the IAT sensor (intake air temperature sensor). Is your car a pre 95 car? Or is it a 95-2004? If it is a pre 95, then you only have one oxygen sensor on the exhaust manifold which should cost around $20 at a store like autozone. BUT if your car is 95 or newer, the O2 sensor Before the cat on the manifold will be around 60, and there is also an O2 sensor after the converter..
someone feel free to correct me but the 95'* only have one O2 sensor and its the 96+ ones that have 2
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