How do you replace an oxygen sensor on a Mercedes 1999 SLK230?

To replace the oxygen sensor on a 1999 Mercedes SLK230, first, ensure the engine is cool and disconnect the negative battery terminal. Locate the oxygen sensor, typically found on the exhaust manifold or downstream in the exhaust system. Use a wrench or oxygen sensor socket to unscrew the old sensor and carefully install the new one, ensuring it's securely tightened. Finally, reconnect the battery and check for any error codes using an OBD-II scanner.