The OBD-II diagnostic port on a 2004 Chrysler Sebring LX is typically located
under the dashboard, on the driver's side. It's usually near the steering column, often within easy reach without having to get completely under the dash. It's a 16-pin connector.
However, it's best to check your owner's manual. The manual will have a diagram showing the exact location of the diagnostic connector. While the general area is consistent across many vehicles, minor variations can exist.