The 9-3 using the B205 engine from 2000 (once again US spec cars) use a pre cat that is squeezed in between engine block and radiator and the front O2 sensor is mounted right after the turbo exhaust flange and in front of the pre cat. The rear O2 sensor is mounted right after the pre cat but before the main cat.
Since you have a 97 900 T, the catalytic converter is different and doesn't have a pre cat (US spec and maybe other countries too) but is mounted under the oil pan so the front O2 sensor is mounted further down (almost exactly where the rear O2 sensor sit on a 2000 9-3) and in your case it might not even have a rear O2 sensor.
After 20 years in the US, I have no clue how cars are equipped in Sweden or any other countries anymore.
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