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Interesting. If there are the same number of wires, it seems like you should have matching sensors. That might mean you have two 02 sensors, but I'm really not sure. You could always pull the front sensor and get a part number off of it. That way you'll know for sure. Might be worth it, because I'm sure putting an AFR calibrator on an 02 sensor can't be a good thing. If you truck is running fine though, it is probably an AFR sensor..
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- 2000 4Runner SR5 - V6 S/C - URD Fuel Upgrade Kit - 2.2" Pulley - Clarion MAX675VD
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