Oxygen sensors

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454cid

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3 out of 4 of mine are Bosch, because that's what the parts store had long ago. The rears were easy to change, but the fronts were not, and I didn't change the driver's side until I had to, which was only maybe a year ago. The passenger side front is still original.

If I were buying today, I'd probably by GM parts of some sort, maybe Delphi in hopes they're still OE.
 

ralmo94

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Ijust wanted to see if anybody had any bad experience with any certain sensors, more or less.
It has been reported time and time again that part store sensors May not read correctly, maybe rich or lean. I have seen this with my wideband gauge, where 20+ year old sensors kept the wide band right on 14.7 with an occasional dip to 14.6 for a brief second. Brand new densos from rock auto liked to keep it around 14.1. Aftermarket Bosch are SUPPOSED to have the worst reputation for this. Never heard anything bad about ac Delco, or denso, ntk. It's a voltage scale, supposed to read about 450 mv or so at stoichiometry.
 

RichLo

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Whatever brand you decide, try to get "universal" ones. They are way cheaper and the only difference is the plug wire is slightly longer than needed and doesnt have a retaining clip attached to the wire if yours currently has a retaining clip.
 

HeavyAsAChevy

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Well, AC Delco, it is.
I didn’t see if they were the upstream or downstream sensors, but if they’re the down streams, I built spacers for mine using spark plug non-foulers, a drill press and a small piece of catalytic converter. If they’re upstream, I just put some densos on my Lexus and are pretty happy with them. I picked up a lot of lost power.
 

kennythewelder

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I didn’t see if they were the upstream or downstream sensors, but if they’re the down streams, I built spacers for mine using spark plug non-foulers, a drill press and a small piece of catalytic converter. If they’re upstream, I just put some densos on my Lexus and are pretty happy with them. I picked up a lot of lost power.
It's up streem. As for the non fouler. I have a write up, thread on this forum, about that. Here it is.
Thread 'remove your cats, and make a mini cat for your rear 02 sensors.' https://www.gmt400.com/threads/remove-your-cats-and-make-a-mini-cat-for-your-rear-02-sensors.30681/
 

HeavyAsAChevy

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It's up streem. As for the non fouler. I have a write up, thread on this forum, about that. Here it is.
Maybe where I learned it. I don’t remember
 
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