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Re: O2 sensor question
If you car still has the original stock exhaust system, the third O2 sensor is mounted in the main converter itself. It is located on the top of the converter at the rear.
When I replaced the converter on my 96 with a Magnaflow unit, I installed the sensor into the side of the exkaust pipe coming directly out of the converter. makes for easy access whenever it needs to be replaced.
The proper aftermarket sensors are below. These are OE direct plug-in replacements. All are three wire, heated sensors
Bosch 13250
NGK 24614
Denso 234-3083
Available on Amazon.com or from Advance Auto Parts for about $65.00. The NGK can be had for $52.00 direct from their website.
A 3-wire oxygen sensor may also be referred to as a HEGO sensor (Heated Exhaust Gas Oxygen Sensor). It has an internal two wire pre-heater which enables the sensor to more rapidly achieve proper operating temperature.
One wire carries the sensor signal while the other two wires supply voltage to the internal heater. The signal ground is achieved through the sensor body where it threads into the exhaust system.
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Subaru Ambassador
1996 Polo Green LSi #216 ..138,100 miles. ..SOLD
JFICX8659TH100216.....Date of Manufacture: November 16, 1995.....
Fuji Heavy Industries..Ōta North Plant....Ōta City,. Gunma Prefecture, Japan
In-Service Date: January 2, 1997
"The Pristine Green Polo Machine”
First Polo Green on the Network
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HID lighting (5000K) for headlight and H3 fog lights, PIAA SuperExtreme 120W high beams, rebuilt EG33 longblock, Cometic head gaskets, Phase II flexplate, AMR aluminum radiator with custom silicone hoses, 160A high-output alternator in aluminum-ceramic coated case, new design alternator wiring upgrade v.4, rare factory headlight protectors, refinished JDM BBS mesh aluminum wheels and custom, polished billet aluminum new hex center caps, LED grille mod, R1 Concepts high-carbon cryo slotted rotors, Akebono ceramic pads, Goodridge S/S braided brake lines, Smallcar Stage 1 shift kit, ThermalTech aluminum/ceramic-coated valve covers, Energy Suspension urethane front & rear swaybar bushings, Bontrager22 rear swaybar with QS Components Chromoly Teflon/Kevlar endlinks, "$15.00/5 minute" suspension mod. Hella Supertone horns, Custom stainless steel exhaust system with 2" headpipes, Magnaflow cats, AeroTurbine AR25 resonator /AWD "Bullet" muffler.
R.I.P. 2010 Subaru Outback Limited 2.5 CVT...338,000 miles. Totaled by a 1,300 lb. COW March 4, 2016 
2014 Hyundai Avante Limited ...178,000 miles. Actually quieter and smoother than the Outback 
2007 Mazda Miata MX-5 PRHT...102,000 miles.
Plenty of parts, service and windshields. 
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