Ford Focus MK3 Fuses: Complete Guide 2010-2018

ByAlex Smidt

The Ford Focus MK3 (2010–2018) features two main fuse boxes that protect every electrical circuit in the vehicle. Whether you’re dealing with a blown fuse, tracing an electrical fault, or simply replacing a component, knowing the exact location, amperage, and function of each fuse is essential. This guide covers all fuse box locations and provides a complete, exhaustive list of every fuse for all variants of the Focus MK3, including pre-facelift (2010–2014) and facelift (2015–2018) models.

Fuse Box Locations on the Ford Focus MK3

The Focus MK3 has two fuse and relay centres:

  • Passenger Compartment Fuse Box – located beneath the dashboard on the driver’s side (left-hand drive) or on the right-hand side (right-hand drive), behind a removable panel.
  • Engine Compartment Fuse Box (Power Distribution Box) – located in the engine bay, on the left side near the battery. It houses high-current fuses and relays for major systems.

How to Access and Replace Fuses

  • Turn the ignition fully off before inspecting or replacing any fuse.
  • For the cabin fuse box, pull the panel cover downward firmly — no tools required.
  • For the engine bay box, press the two side clips and lift the cover vertically.
  • Use the fuse puller (stored inside the cabin fuse box cover) or needle-nose pliers.
  • Always replace with a fuse of identical amperage. Never fit a higher-rated fuse.
  • If a replacement fuse blows immediately, there is a short circuit — do not retry without diagnosing the fault.

Passenger Compartment Fuse Box – Full Fuse List

  • F1 – 10A – Heated rear window switch, heated mirror switch
  • F2 – 20A – Cigar lighter / 12V power socket (front)
  • F3 – 10A – Instrument cluster, engine management warning lights
  • F4 – 10A – Audio system, clock, interior lighting
  • F5 – 15A – Wiper motor (front)
  • F6 – 10A – Central locking module, door lock actuators
  • F7 – 5A – Body control module (BCM) keep-alive power
  • F8 – 10A – Brake light switch, stop lights
  • F9 – 10A – Reversing lights, transmission range sensor
  • F10 – 10A – SYNC / MyFord Touch infotainment system
  • F11 – 10A – Powertrain control module (PCM) signal supply
  • F12 – 20A – Heated front seats (driver)
  • F13 – 20A – Heated front seats (passenger)
  • F14 – 10A – Airbag / SRS module
  • F15 – 10A – Rain and light sensor, auto-dimming mirror
  • F16 – 10A – Climate control module, blower motor control
  • F17 – 20A – Electric windows (rear)
  • F18 – 20A – Electric windows (front)
  • F19 – 10A – Keyless entry module, PEPS system
  • F20 – 10A – Diagnostic connector (OBD-II port power)
  • F21 – 15A – Horn
  • F22 – 10A – Fuel pump relay control signal
  • F23 – 10A – Rear wiper motor
  • F24 – 10A – Parking sensors module, reversing camera
  • F25 – 15A – Interior lighting, map lights, boot light
  • F26 – 10A – Traction control / ESP / stability control module
  • F27 – 10A – Steering angle sensor, EPAS module signal
  • F28 – 10A – Sunroof motor control module
  • F29 – 5A – Tyre pressure monitoring system (TPMS)
  • F30 – 20A – 12V socket (boot / rear)

Engine Compartment Fuse and Relay Box – Full Fuse List

  • F1 – 60A – Electric power assisted steering (EPAS) motor
  • F2 – 40A – Blower motor (HVAC)
  • F3 – 30A – ABS / ESP hydraulic pump motor
  • F4 – 30A – Cooling fan motor (high speed)
  • F5 – 20A – Cooling fan motor (low speed)
  • F6 – 15A – Engine management – fuel injectors (petrol engines)
  • F7 – 15A – Diesel glow plugs relay control (diesel variants)
  • F8 – 30A – Heated rear window (HRW) element
  • F9 – 20A – Fuel pump relay output
  • F10 – 15A – Oxygen sensors / lambda sensors, EGR valve
  • F11 – 10A – PCM / ECU main power supply
  • F12 – 10A – Throttle body actuator, idle speed control
  • F13 – 15A – Alternator field winding / charge warning
  • F14 – 30A – Anti-lock braking system (ABS) module power
  • F15 – 20A – Starter motor relay circuit
  • F16 – 40A – Main battery junction – always live supply
  • F17 – 60A – Megafuse – main body power distribution
  • F18 – 30A – Trailer module / tow bar wiring kit (if fitted)
  • F19 – 20A – Headlamp washers (if fitted)
  • F20 – 15A – Front fog lights
  • F21 – 10A – Daytime running lights (DRL) module
  • F22 – 15A – Xenon / HID headlamp ballasts (if fitted)
  • F23 – 10A – Transmission control module (TCM) – PowerShift DCT
  • F24 – 15A – Variable valve timing solenoids (EcoBoost engines)

Common Fuse Problems on the Ford Focus MK3

  • Cigarette lighter not working – check F2 (20A) in the cabin box first.
  • Central locking failure – inspect F6 (10A) in the cabin fuse box.
  • No instrument cluster illumination – F3 (10A) cabin box.
  • Heated rear screen not working – F8 (30A) in the engine bay box.
  • Electric windows inoperative – check F17 and F18 (both 20A) in the cabin box.
  • EPAS warning / heavy steering – F1 (60A) in the engine bay box; requires a maxi-fuse.
  • ABS warning light on, ABS inactive – check F3 (30A) and F14 (30A) in the engine bay box.
  • OBD port has no power – F20 (10A) in the cabin box.

Fuse Types Used in the Focus MK3

  • Mini blade fuses (ATC/ATO) – used throughout the cabin fuse box for circuits up to 30A.
  • Maxi blade fuses – used in the engine bay box for high-current circuits (40A–60A).
  • Mega fuse (bolt-down) – the main 60A battery protection fuse (F17) requires a specific Ford-type mega fuse.
  • Colour coding: 5A = tan, 7.5A = brown, 10A = red, 15A = blue, 20A = yellow, 25A = natural/white, 30A = green, 40A = orange, 60A = yellow maxi.

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