To be certain, you should:
* Consult your owner's manual: This is the best resource for the exact location in your specific vehicle.
* Use a repair manual: A Haynes or Chilton manual for your year and model will have diagrams showing the PCM's location.
* Look online: Search for "1999 Lincoln Town Car PCM location" along with images. This can provide visual confirmation.
Remember to be careful when working around the engine compartment; it contains hot surfaces and electrical components.