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well, assuming no 1 ever touch it, there'd be a sticker on the ECU's side saying how to get the codes. basically with a flat head screw driver, turn the potentiometer clockwise till it stops, wait 5 seconds, turn it counterclockwise till it stops..the LED should blink then.
O2 sensor would be along the exhaust.. just follow the exhaust manifold downward.. should be right after the 4 runners merge into 1..
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