I need an O2 for my swap. I priced a new one and they are $200+.
I had a thought that I would pick up one at the junkyard.
They asked me what engine. I told them GSR.
They told me they didn't have any.

Wouldn't they all be the same? Even off of a Civic as long as its 4 wire?

Unless you guys know where to get a new one for less.

I tried searching but O2 is too small to work on this search engine.

 

yes any 4 wire honda will work, even OBD2 rear o2 sensor (wires are longer thats all)

greg

 

I have a used four wire sensor that works fine if you want it IM me.

 

Not all 4 wire O2 sensors are the same. When I did my B16 swap into my 99 EX i tried to use my EX O2 sensor but the plug is different. I do beleive that all Integra's use the same primary O2 sensor as does the 99-2000 si. Check denso's website and it gives the part numbers of the O2 sensors.
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Taken from Denso's website

For 2000 Acura Integra

GS L4/1.8 -- Front 234-4011 234-4209
GS L4/1.8 -- Rear 234-4659 234-4209
GSR L4/1.8 -- Front 234-4011 234-4209
GSR L4/1.8 -- Rear 234-4659 234-4209
LS L4/1.8 -- Front 234-4011 234-4209
LS L4/1.8 -- Rear 234-4659 234-4209
TYPE-R L4/1.8 -- Front 234-4011 234-4209
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Hope this helps