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There are two of them: The first one is located off the exhaust manifold and is NOT usually the problem child. The second one is located near the catalytic converter under the car in the exhaust system. THAT is the one that is most commonly defective or is malfunctioning. I've been advised that they last about 60,000 miles on average..

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Q: Where is the 02 sensor on a 1998 4 runner Toyota located?
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