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The screws that hold the rear lights in place on a focus are inside behind the rear pillar trim
Check your brake pads.
Fuse number 54
its a 2001 ford focus 1.6 petrol
From inside the luggage compartment.
Check brake lights--if they do not work shift interlock will not release
Make sure you have a good earth ground between the body of the car, the engine block and the battery.
Replace the switch at the brake pedal. If you need help with that, get a manual at Auto Zone. They're a lot cheaper than a mechanic. I had same problem on my 2K . I would first ck. both of the tail / brake bulbs to see if one of the filaments are bad. This CAN cause tail lights to burn bright as brake lights and if you step on brake you will NOT see any difference. Do yourself a favor CHANGE BOTH BULBS at same time ; clean socket and use dielectric grease in socket. FWIW, a bad reverse light socket CAN cause hard shift on auto. For some reason focus has problem with electric connections ie. CORROSION
A Ford Focus fuse diagram will show the placement of all fuses for the vehicle including the brake and headlights, the interior lights, and the dashboard lights. This diagram is generally located on the inside cover of the fuse box.
Running lights (left side): Fuse #47 -- Running lights (right side): Fuse #48 -- Brake lights: Fuse #54. Fuse panel is on the lower left side (underneath) the dashboard. NOTE: If it is your brake lights that are not working and fuse # 54 looks okay, check the brake light switch, it may have gone bad.
Are you sure you need the fuse for the cruise control. My cruise control wasn't working, neither were my brake lights. All 7 bulbs were burnt out. When the brake lights were replaced the cruise control worked.
The brake light switch might not be connected properly. Remove the brake light switch for 10 seconds and replace it to its original position.