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The O2 sensor(s) is(are) always in the exhaust pipe near the engine. Just run your hand along the pipe until you find something sticking out that has wires attached to it. Some cars have an O2 sensor before and after the catalytic converter. My Ford had a catalytic converter for each bank of cylinders so it had a total of four O2 sensors. Bob

The O2 sensors on the 300zx tt are on the pre-cats. These can be seen at the back of the engine, just after the exhaust manifold. They run down to the main exhaust beneath the car. The wires from them run up to easily accessible harness connectors. The left hand one is at the back of the engine, the right hand one is at the right hand side. More details are here http://www.twinturbo.net/Nissan/300zx/FAQ/FAQpages/O2s.html Richard

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