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One... It's screwed right into the exhaust manifold. It's very easy to get to but can be hard to get the old one out... They make special sockets for O2 sensors.
I own a 97' geo but have two sensors...
From 1996 on, the system is OBD-II, which has two oxygen sensors, one on the exhaust manifold and a second one on the catalytic converter. Pre-96 only have one on the exhaust manifold. The sensor wiring varies with 3-pin and 4-pin variations.
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