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To replace an oxygen sensor on a Volvo, first, ensure the engine is cool and disconnect the negative battery terminal. Locate the oxygen sensor, which is typically found in the exhaust system, either upstream (before the catalytic converter) or downstream (after the catalytic converter). Use a socket wrench to unscrew the old sensor and carefully disconnect its wiring harness. Install the new sensor by reversing the process, ensuring a secure connection, and then reconnect the battery.

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