To know what the light means, you'll need to:
* Look at the symbol: The light will usually have a symbol next to it or within the light itself (like an image of a brake pad, engine, battery, etc.).
* Consult your owner's manual: The owner's manual for your specific year and model of Lincoln Town Car will have a diagram of the dashboard lights and their meanings. This is the most reliable source.
Without knowing the symbol of the light, it's impossible to say what it means. It could indicate anything from low tire pressure to a serious engine problem.