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AC Delco heated O2 sensors

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Nick Micale

Tech Advisor
Staff member
Joined
May 26, 2001
Messages
9,208
These are original AC Delco, 4-wire, AFS-109 O2 sensors made in the USA.

I have 4 of them at $25 each.

Make a reasonable offer on all 4 and will consider. :)
 

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I have no experience with those. Benefits? How do you connect them?
 
Adapter harness needed for this O2 sensor

I have no experience with those. Benefits? How do you connect them?

Thanks for asking Irv, the heater O2 sensor is a 4 wire connection, not the single one like stock.

A one time, maybe still, Casper's made a plug-and-play adapter harness so no cutting or any mods were needed.

Since you have pointed this out, I want any potential buyer to know this.

Going through my "pile" of old stuff, I do have one new adapter harness.

I will honor the requests for purchase as they are in line here, but I want to be sure all potential buyers know about the need for an adapter harness before hand. :)
 
I am sorry guys, captflash was first in line and he had said he will take the package.

Thanks for your interest and stay tuned as I clear out my stock of other 20+ year old turbo Buick parts. :)
 
I run 93 and methanol. Whats the best O2 for me? I just replaced with a Denso like i always used. Do they normally jump higher numbers at higher rpm's than at idle?
 
I have not changed mine sence I bought the car. I installed ATRheaders Saturday and I pulled the old one out with by the way was a GM and put it right back in . But the numbers will bounce around , mine does. The one you got should be fine.
 
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