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It appears that there were a couple of configurations of 323 and you did not mention your year. but the car definitely came with either three or four oxygen sensors. If there are no sensors in place on the exhaust manifolds and below the cat, then either there are plugs in those holes, or someone has replaced the manifolds and exhaust pipes and has installed a circuit that tricks the ECU into thinking that it has oxygen sensors. If that is the case, I would not expect that you have catalytic converters below the manifolds either.
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