Putting on my 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 01-24-2005, 07:36 PM   #11
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Quote:
Originally Posted by ssesc93
where is the other one at then? Darn, I thought I was finished with the car. :(
there is one on the muffler side of the CAT.
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Old 01-24-2005, 07:37 PM   #12
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I guess I will do change that once I change my fuel filter.
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Old 01-24-2005, 07:39 PM   #13
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Quote:
Originally Posted by ssesc93
I guess I will do change that once I change my fuel filter.
Don't change it yet! Corvettecrazy asked a question I was going to ask (I think mine'* getting lazy). I've heard that one is more important than the other. I think one of them can be left original for a long time.

Gearheads?
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Old 01-24-2005, 07:41 PM   #14
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Quote:
Originally Posted by ssesc93
I guess I will do change that once I change my fuel filter.
You only have one Steve, Don't worry about it

Usually the front ones on OBD II cars are the ones you need to replace, the rears are there to keep an eye on the Catalytic converter. The front one senses the temp of the exhaust gas, and the second one shows the PCM what changed.
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Old 01-24-2005, 07:42 PM   #15
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Quote:
Originally Posted by BonneMeMN
Quote:
Originally Posted by ssesc93
I guess I will do change that once I change my fuel filter.
You only have one Steve, Don't worry about it

Usually the front ones on OBD II cars are the ones you need to replace, the rears are there to keep an eye on the Catalytic converter. The front one senses the temp of the exhaust gas, and the second one shows the PCM what changed.
Is it safe to say that the rear can remain original, then?

Also, does anyone have the GM part # for the front O2 on a 99 L36?
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Old 01-24-2005, 07:47 PM   #16
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I don't know recommended change intervals, but I don't know if i would let the rear one go past 100k. From my understanding it really is there to trip a SES light for the cats, since OBD II is heavily scrutenized during emissions testing, etc.

I believe the front one is the one that controls Gas Milage.
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Old 01-24-2005, 07:48 PM   #17
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Also, does anyone have the GM part # for the front O2 on a 99 L36?

http://www.bonnevilleclub.com/techinfo/?article=49
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Old 01-24-2005, 08:07 PM   #18
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Quote:

Is it safe to say that the rear can remain original, then?

Also, does anyone have the GM part # for the front O2 on a 99 L36?
Quote:
Also, does anyone have the GM part # for the front O2 on a 99 L36?


Isn't this it?

Quote:
98-02 VIN# K,1 POSN1
GM# 25312203 (AC Delco #AFS-109)
$55.86
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Old 01-24-2005, 08:08 PM   #19
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I thought the K was the L36
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Old 01-24-2005, 08:29 PM   #20
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Quote:
Originally Posted by ssesc93
I thought the K was the L36
It is..you're right. I'm going to order a new one right now... 98K and still on the original. Gas mileage is slipping... Down to 19 MPG.
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