Ford Focus · 2018
2018 Ford Focus Brake Light Fuse
Brake lights not coming on? Check the stop lamp fuse. Driving without working brake lights is unsafe and illegal.
- UK specification
- Verified data
- Checked 14 October 2026
- Sources
Where is the fuse box?
Option A Focus (2015) or Focus RS (2015)
Engine compartment fuse box
In the engine compartment
Our source doesn’t describe how to open this fuse box. Check your owner’s handbook.
Option B Focus Electric (2015)
Electric motor compartment fuse box
In the electric motor compartment (under the bonnet)
- Lift the release lever at the rear of the cover to remove it.
Option C Focus (2018) or Focus Vignale (2018)
Engine compartment fuse box
In the engine compartment
Our source doesn’t describe how to open this fuse box. Check your owner’s handbook.
Fuse box diagram
Full 2018 Ford Focus fuse chartOption A Focus (2015) or Focus RS (2015)
We haven’t drawn a schematic of the engine compartment fuse box for this version yet. Use the fuse and relay numbers on this page and the legend on the fuse box to find the right position.
Where to look
- F21
In the engine compartment
Fuse ·5A · Brake lamps.
Position not shown on the schematic. Find fuse F21 on the fuse box legend.
Always confirm the number against the legend on the fuse box cover before pulling anything.
Option B Focus Electric (2015)
We haven’t drawn a schematic of the electric motor compartment fuse box for this version yet. Use the fuse and relay numbers on this page and the legend on the fuse box to find the right position.
Where to look
- F21
In the electric motor compartment (under the bonnet)
Fuse ·5A · Stoplamp switch.
Position not shown on the schematic. Find fuse F21 on the fuse box legend.
Always confirm the number against the legend on the fuse box cover before pulling anything.
Option C Focus (2018) or Focus Vignale (2018)
We haven’t drawn a schematic of the engine compartment fuse box for this version yet. Use the fuse and relay numbers on this page and the legend on the fuse box to find the right position.
Where to look
- 44
In the engine compartment
Fuse ·10A · Stoplamp switch.
Position not shown on the schematic. Find fuse 44 on the fuse box legend.
Always confirm the number against the legend on the fuse box cover before pulling anything.
How to replace the fuse safely
- Switch off the ignition and all electrical equipment. Take the key out, or move a keyless fob away from the car.
- Open the fuse box and find the fuse using the number on the cover legend or the chart on this page.
- Pull the fuse straight out with the plastic fuse puller (usually clipped inside the fuse box) or fine-nose pliers.
- Look at the metal strip inside the fuse. A broken or burnt strip means it has blown.
- Fit a new fuse with exactly the same amperage rating. The number on top and the colour should match.
- Refit the cover, switch on and test the component.
- Never fit a fuse with a higher amperage rating than specified. It can let wiring overheat.
- Never bridge a fuse with wire, foil or anything else.
Fuse keeps blowing?
A fuse that blows again straight away is doing its job. Something on that circuit is drawing too much current. Common causes are damaged wiring shorting to the bodywork, a failing motor or socket, water getting in, or a faulty accessory. Fitting fuse after fuse, or a bigger fuse, won’t fix the fault and can overheat the wiring. Have the circuit tested by an auto electrician.
Not the fuse? Check these next.
Brake light switch
If every brake light is out but the fuse is fine, the switch at the top of the brake pedal is a common cause.
Bulbs
If only one light is out, replace the bulb. Ask someone to watch while you press the pedal.
Lights stay on
Brake lights that never go off usually point to a faulty or badly adjusted brake light switch.
Sources & verification
Focus (2015) · Built from 5 September 2016
- Manufacturer manual listingFord UK — 2016 Focus (2015) owner manuals · Ford Motor Company · Owner’s Manual (Vehicles Built From: 05/09/2016) · Accessed 14 October 2026
- Manufacturer manual listingFord UK — 2017 Focus (2015) owner manuals · Ford Motor Company · Owner’s Manual (Vehicles Built From: 05/09/2016) · Accessed 14 October 2026
- Manufacturer manual listingFord UK — 2018 Focus (2015) owner manuals · Ford Motor Company · Owner’s Manual (Vehicles Built From: 05/09/2016) · Accessed 14 October 2026
- Online owner’s manualFord Focus (2015) online Owner’s Manual (O35785) — Fuse Specification Chart · Ford Motor Company · Fuse specification chart — Engine compartment fuse box; Fuse specification chart — Passenger compartment fuse box; Fuse specification chart — Luggage compartment fuse box · Accessed 14 October 2026
Focus RS (2015) · Built from 5 September 2016
- Manufacturer manual listingFord UK — 2016 Focus RS (2015) owner manuals · Ford Motor Company · Owner’s Manual (Vehicles Built From: 05/09/2016) · Accessed 14 October 2026
- Manufacturer manual listingFord UK — 2017 Focus RS (2015) owner manuals · Ford Motor Company · Owner’s Manual (Vehicles Built From: 05/09/2016) · Accessed 14 October 2026
- Manufacturer manual listingFord UK — 2018 Focus RS (2015) owner manuals · Ford Motor Company · Owner’s Manual (Vehicles Built From: 05/09/2016) · Accessed 14 October 2026
- Online owner’s manualFord Focus RS (2015) online Owner’s Manual (O35785) — Fuse Specification Chart · Ford Motor Company · Fuse specification chart — Engine compartment fuse box; Fuse specification chart — Passenger compartment fuse box; Fuse specification chart — Luggage compartment fuse box · Accessed 14 October 2026
Focus Electric (2015) · Built from 16 January 2017
- Manufacturer manual listingFord UK — 2017 Focus Electric (2015) owner manuals · Ford Motor Company · Owner’s Manual (Vehicles Built From: 16/01/2017) · Accessed 14 October 2026
- Manufacturer manual listingFord UK — 2018 Focus Electric (2015) owner manuals · Ford Motor Company · Owner’s Manual (Vehicles Built From: 16/01/2017) · Accessed 14 October 2026
- Online owner’s manualFord Focus Electric (2015) online Owner’s Manual (O37033) — Fuse Specification Chart · Ford Motor Company · Fuse specification chart — Pre-fuse box; Fuse specification chart — Electric motor compartment fuse box; Fuse specification chart — Passenger compartment fuse box; Fuse specification chart — Load compartment fuse box · Accessed 14 October 2026
Focus (2018) · Built up to 14 October 2018
- Manufacturer manual listingFord UK — 2018 Focus (2018) owner manuals · Ford Motor Company · Owner’s Manual (Vehicles Built Up To: 14/10/2018) · Accessed 14 October 2026
- Manufacturer manual listingFord UK — 2019 Focus (2018) owner manuals · Ford Motor Company · Owner’s Manual (Vehicles Built Up To: 14/10/2018) · Accessed 14 October 2026
- Online owner’s manualFord Focus (2018) online Owner’s Manual (O40619) — Fuse Specification Chart · Ford Motor Company · Fuse specification chart — Engine compartment fuse box; Fuse specification chart — Passenger compartment fuse box; Fuse specification chart — Trailer tow module fuse box (5-door and wagon) · Accessed 14 October 2026
Focus (2018) · Built 15 October 2018 to 13 January 2019
- Manufacturer manual listingFord UK — 2018 Focus (2018) owner manuals · Ford Motor Company · Owner’s Manual (Vehicles Built From: 15/10/2018 Vehicles Built Up To: 13/01/2019) · Accessed 14 October 2026
- Manufacturer manual listingFord UK — 2019 Focus (2018) owner manuals · Ford Motor Company · Owner’s Manual (Vehicles Built From: 15/10/2018 Vehicles Built Up To: 13/01/2019) · Accessed 14 October 2026
- Online owner’s manualFord Focus (2018) online Owner’s Manual (O59265) — Fuse Specification Chart · Ford Motor Company · Fuse specification chart — Engine compartment fuse box; Fuse specification chart — Passenger compartment fuse box; Fuse specification chart — Trailer tow module fuse box (5-door and wagon) · Accessed 14 October 2026
Focus Vignale (2018) · Built up to 14 October 2018
- Manufacturer manual listingFord UK — 2018 Focus Vignale (2018) owner manuals · Ford Motor Company · Owner’s Manual (Vehicles Built Up To: 14/10/2018) · Accessed 14 October 2026
- Online owner’s manualFord Focus Vignale (2018) online Owner’s Manual (O86113) — Fuse Specification Chart · Ford Motor Company · Fuse specification chart — Engine compartment fuse box; Fuse specification chart — Passenger compartment fuse box; Fuse specification chart — Trailer tow module fuse box (5-door and wagon) · Accessed 14 October 2026
Focus Vignale (2018) · Built 15 October 2018 to 13 January 2019
- Manufacturer manual listingFord UK — 2018 Focus Vignale (2018) owner manuals · Ford Motor Company · Owner’s Manual (Vehicles Built From: 15/10/2018 Vehicles Built Up To: 13/01/2019) · Accessed 14 October 2026
- Manufacturer manual listingFord UK — 2019 Focus Vignale (2018) owner manuals · Ford Motor Company · Owner’s Manual (Vehicles Built From: 15/10/2018 Vehicles Built Up To: 13/01/2019) · Accessed 14 October 2026
- Online owner’s manualFord Focus Vignale (2018) online Owner’s Manual (O112663) — Fuse Specification Chart · Ford Motor Company · Fuse specification chart — Engine compartment fuse box; Fuse specification chart — Passenger compartment fuse box; Fuse specification chart — Trailer tow module fuse box (5-door and wagon) · Accessed 14 October 2026
Fuse layouts can differ between trim levels and optional equipment. Always confirm against the legend on your fuse box.