Which oxygen sensor is it?

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, Olds 98 91-96, Buick Lesabres and Park Avenue 91-96. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.
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ohenry5
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Which oxygen sensor is it?

Post by ohenry5 »

Hey guys, havent been on in awhile but always know I can turn here when theres trouble. Sorry if this is a repeat but could not find it by doing a search. Scanned the code and got O2 Sensor Heater Circuit Malfunction Bank 1 / Sensor 1. I know I have to replace the O2 sensor but I am not sure which one, I assumed sensor 1 would be the one before the cat. but I have seen some info that caused me to doubt. So which one is bank 1 / sensor 1, before or after the cat. Thanks guys!
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Re: Which oxygen sensor is it?

Post by 00Beast »

It's on the top of the rear manifold, pre cat.

There are only 2 sensors on these cars, and sensor 2 is the one behind the cat.
Last edited by 00Beast on Wed Dec 01, 2010 6:34 pm, edited 1 time in total.
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Re: Which oxygen sensor is it?

Post by LeSabre in Buffalo »

What 00Beast said.

Get the Delco sensor from RockAuto. They seem to be better-made than the Denso sensors these days...
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ohenry5
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Re: Which oxygen sensor is it?

Post by ohenry5 »

This is what confused me, Rockauto has the ACdelco listed and it says Position 1 is in the exhaust manifold crossover, and Position 2 is pre cat? Sorry for the maybe dumb question but isnt the exhaust manifold/crossover before the cat? So then both of these are pre cat?! In laymens terms, do I need the one that I can see if I look behind the engine? Thanks guys!

ACDELCO Part # AFS109 More Information About this Part {#19178958, 25312211, AFS125}
SENSOR,HTD OXY(POSN 1) IN EXH MANIFOLD/CROSSOVER

ACDELCO Part # AFS123 {#12587214, 19178921, 19178924, AFS116, AFS97} replaces AFS97
SENSOR,OXY (POSN 2) PRE CONVERTER
Last edited by ohenry5 on Wed Dec 01, 2010 10:10 pm, edited 1 time in total.
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Re: Which oxygen sensor is it?

Post by LeSabre in Buffalo »

AFS109 is the part you want. The AFS123 is behind the catalyst. Looks like RockAuto isn't totally on the ball with this.
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