Why won't the rear lights go out on my Focus?

Ford Focus 2002. Rear lights are permanently on when in Drive, so nobody can see when I'm braking. Mechanic ordered new part, installed it, but it's not fixed. Can anyone help? Will I have to take it to Ford?

The only rear lights that could be on and not allow the cars behind to see the brake lights, are the brake lights. There are only 4 ways they can stay on:

1. The brake pedal is dragging and pressing on the Brake Switch. An adjustment can usually fix that but I would recommend the Brake Switch be replaced and adjusted properly.

2. The Brake Switch has failed and needs to be replaced and adjusted properly.

3. Someone changed the rear bulbs and put in the wrong Bulb(s). It only takes one wrong bulb (in the rear tail light assembly to cause this.

4. A Trailer Converter can fail. The converter is installed when the vehicle has there tail light and stop light in one bulb. These bulbs are called Dual-Elements Bulbs. Trailers are all Single-Elements. In other words, there turn signal lights are separate from the stop lights and tail lights. The converter isolates the different circuits so the all the trailer lights work properly.

This repair is simple. If the mechanic can't easily fix it, then never use him again.

This is a 2002 Ford Focus, The year goes first. There's a short somewhere. The system is getting a signal as if the brake are applied. Did the mechanic changed the brake switch but that was not the issue? I hope you did not pay for that. If this mechanic is out of ideas, sorry, he is not much of mechanic. Go somewhere else. Ford trained mechanics repair Ford cars all day. I take my car to my Ford dealership. If this is the solution, go there but do not drive this car without this being repaired.