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Hi 240 Matt,
The car was designed as a system. If you change one thing you must change the others. If you don't change the others then its almost as it was before.
The oxygen sensor only works when it has reached almost 600 C. One wire sensor is usually located in the manifold (close to the exhaust outlet) so that it reaches its operating temp quicker.
Three wires sensor (2 for heater 1 for sensing) may be located far from the manifold. It becomes heated first by its heater then by the exhaust gases.
Two wire sensor (1 for heater 1 for sensing) may use the sensor body for common electrical ground. For more sensitive ECU the 2 wires sensor is not used as sharing electrical ground may interfere with its sensing ability.
Best option...stick to the original. Less headache. Easier for you.
What's more important here is not about the sensor. It's about the grounding. Use a voltmeter (set to ohms reading) and check the exhaust grounding. It should be less than 1 ohm. The sensor's output is very small. Any high ground resistance may interfere with ECU reading the sensor. Usually its the rusts at the exhaust that causes poor grounding.
Amarin.
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