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Code PO154 on a 2000 Volvo S80 indicates an issue with the oxygen sensor circuit, specifically related to the upstream oxygen sensor. To fix it, start by inspecting the wiring and connectors for any damage or corrosion. If everything appears intact, test the oxygen sensor itself and replace it if it's faulty. Finally, clear the trouble code and take the vehicle for a test drive to ensure the issue is resolved.
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