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There are O2 sensors on the 99 1.6L Protege I don't know about the 1.8L. The 1st one is located at the top of the exhaust manifold where it comes off the engine. The 2nd is located about a foot down the manifold from the 1st. They are not cheap to replace I suggest you know witch one is bad before you replace it.

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Q: Where is the O2 sensor on a 1999 Mazda Protege?
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