To be certain, you should:
* Consult a repair manual specific to your 1993 Geo Metro: This is the most reliable way to find the exact location. The manual will have diagrams and clear instructions.
* Use a parts diagram: Online auto parts stores (like AutoZone, Advance Auto Parts, etc.) often have online parts diagrams. Search for your car's year, make, and model and look for the crank sensor. The diagram will show its position on the engine.
Without visual confirmation using one of these methods, pinpointing the exact location is difficult and could lead to wasted time. Remember to be careful when working around engine components.