Will this clear a check engine light caused by my old sensor?

Yes—if your light is solely from a bad O2 sensor reading, this replacement will resolve the fault code. Have the system scanned before install to confirm the sensor is the culprit.

Do I need any special tools to remove the old sensor?

An O2 sensor socket (cheap, widely available) or a wrench makes removal easier, but the sensor unscrews by hand if you let the engine cool first. Anti-seize lubricant helps future removal.

What if the sensor won't thread in smoothly?

Check that the threaded bung in your manifold isn't clogged with carbon. Run a soft wire through it or use a gasket scraper. Never force the sensor; it should thread cleanly into the factory bore.