Audi Q3 (2018 – 2026) Fuse Box Location & Diagrams

Mechatronic unit DSG gearbox / Selector / Automatic transmission control unit

ABS control unit J104 (MK60 valves)

Horn relay / High tone horn / Low tone horn

Voltage stabilizer / Supply for fuses: / to [only for vehicles with start-stop system]

On-board power supply control unit / Battery monitoring control unit

Onboard power supply control unit (right direction indicator, right low beam headlight, right high beam headlight, right fog light, left cornering light, front left parking light, left daytime running light, rear right parking light, left brake light, right reversing light, number plate light, left fog light)

Onboard power supply control unit / Windscreen and rear window washer pump

Onboard power supply control unit (left turn signal, left low beam headlight, left high beam headlight, left fog light, right cornering light, front right parking light, right daytime running light, rear left parking light, right brake light, right fog light)

Electric lumbar support adjustment / Driver’s seat lumbar support adjustment switch / Driver’s seat lumbar support longitudinal adjustment motor / Driver’s seat lumbar support height adjustment motor / Front passenger seat lumbar support adjustment switch / Front passenger seat lumbar support longitudinal adjustment motor / Front passenger seat lumbar support height adjustment motor

Glow plug control unit [only for vehicles with diesel engines]

Lambda probe heating element [only for vehicles with petrol engines] / Lambda probe heating element 1 after catalytic converter [only for vehicles with petrol engines]

Steering column electronics control unit

Mobile Phone Amplifier / Phone Holder

Terminal 30 power supply relay [only for vehicles with diesel engines] / Engine control unit [only for vehicles with diesel engines] / / Main relay [only for vehicles with a 2.5 l petrol engine] / Engine control unit [only for vehicles with a 2.5 l petrol engine]

Main relay [only for vehicles with petrol engines] [except for vehicles with a 2.5 l petrol engine] / Engine control unit [only for vehicles with petrol engines] [except for vehicles with a 2.5 l petrol engine]

Engine control unit [only for vehicles with diesel engines]

Engine control unit [only for vehicles with petrol engines] [except for vehicles with a 2.5 l petrol engine]

Engine control unit [only for vehicles with a 2.5 l petrol engine]

Data bus diagnostic interface

Boost pressure control solenoid valve [only for vehicles with diesel engines] / Exhaust gas recirculation cooler changeover valve [only for vehicles with diesel engines] / Air mass meter [only for vehicles with diesel engines] / Relay for reducing agent metering system [only for vehicles with diesel engines] / Heater resistor for crankcase ventilation system [only for vehicles with diesel engines] / Fuel pump relay [only for vehicles with diesel engines] / / Additional coolant pump relay [only for vehicles with a 2.5 l petrol engine] / Coolant circulation circuit solenoid valve [only for vehicles with a 2.5 l petrol engine] / Coolant circulation pump [only for vehicles with a 2.5 l petrol engine] / Oil pressure regulating valve

Fuel pressure regulator [only for vehicles with petrol engines] [except for vehicles with a 2.5 l petrol engine] / Glow plugs for engine

Fuel metering valve [only for vehicles with a 2.5 l petrol engine]

Lambda probe heating element [only for vehicles with diesel engines]

Fuel pump control unit [only for vehicles with petrol engines]

Electronic information systems control unit 1 / Radio/radio tuner / Voltage stabiliser / Digital sound package control unit

Clutch pedal position sensor

Control unit for reducing agent heating

Windscreen wiper motor control unit

Fuel pump relay [only for vehicles with diesel engines] / Radiator fan control unit [only for vehicles with diesel engines] / Low heat output relay [only for vehicles with diesel engines] / High heat output relay [only for vehicles with diesel engines] / EGR cooler pump [only for vehicles with diesel engines] / / Auxiliary coolant pump relay [only for vehicles with petrol engines] [except for vehicles with a 2.5 l petrol engine] / Radiator fan control unit [only for vehicles with petrol engines] [except for vehicles with a 2.5 l petrol engine] / Engine electronics power supply relay [only for vehicles with petrol engines] [except for vehicles with a 2.5 l petrol engine] / Boost pressure control solenoid valve [only for vehicles with petrol engines] [except for vehicles with a 2.5 l petrol engine] / Activated carbon filter solenoid valve 1 [only for vehicles with petrol engines] [except for vehicles with a 2.5 l petrol engine] / Intake camshaft position adjuster valve 1 [only for vehicles with petrol engines] [except for vehicles with a 2.5 l petrol engine] / Turbocharger wastegate valve [only for vehicles with petrol engines] [except for vehicles with a 2.5 l petrol engine] / Intake manifold flaps valve [only for vehicles with petrol engines] [except for vehicles with a 2.5 l petrol engine] / Oil pressure regulating valve [only for vehicles with petrol engines] [except for vehicles with a 2.5 l petrol engine] / / Radiator fan control unit [only for vehicles with a 2.5 l petrol engine] / Engine electronics power supply relay [only for vehicles with a 2.5 l petrol engine] / Exhaust flap unit [only for vehicles with a 2.5 l petrol engine] / Charge pressure control solenoid valve [only for vehicles with a 2.5 l petrol engine] / Activated charcoal filter solenoid valve 1 [only for vehicles with a 2.5 l petrol engine] / Turbocharger wastegate valve [only for vehicles with a 2.5 l petrol engine] / Intake manifold flap valve [only for vehicles with a 2.5 l petrol engine]

Fuel pressure regulator [only for vehicles with diesel engines] / Fuel metering valve [only for vehicles with diesel engines] / / Ignition coil 1 with output stage [only for vehicles with petrol engines] [except for vehicles with a 2.5 l petrol engine] / Ignition coil 2 with output stage [only for vehicles with petrol engines] [except for vehicles with a 2.5 l petrol engine] / Ignition coil 3 with output stage [only for vehicles with petrol engines] [except for vehicles with a 2.5 l petrol engine] / Ignition coil 4 with output stage [only for vehicles with petrol engines] [except for vehicles with a 2.5 l petrol engine]

Valve 1 for intake camshaft adjustment [only for vehicles with a 2.5 l petrol engine] / Valve 1 for exhaust camshaft adjustment [only for vehicles with a 2.5 l petrol engine] / Oil pressure regulating valve [only for vehicles with a 2.5 l petrol engine]

Driver’s door control unit / Rear left door control unit

Front passenger door control unit / Rear right door control unit

Terminal 15 power supply relay / Power supply for fuses: -SC9- to -SC16-, -SC25-, -SC26-, -SC27-

Glow plug control unit [only for vehicles with diesel engines] / Glow plug 1 [only for vehicles with diesel engines] / Glow plug 2 [only for vehicles with diesel engines] / Glow plug 3 [only for vehicles with diesel engines] / Glow plug 4 [only for vehicles with diesel engines]

Ignition coil 1 with output stage [only for vehicles with a 2.5 l petrol engine] / Ignition coil 2 with output stage [only for vehicles with a 2.5 l petrol engine] / Ignition coil 3 with output stage [only for vehicles with a 2.5 l petrol engine] / Ignition coil 4 with output stage [only for vehicles with a 2.5 l petrol engine] / Ignition coil 5 with output stage [only for vehicles with a 2.5 l petrol engine]

Thermal fuse 1 for driver’s seat adjustment / Thermal fuse 1 for front passenger seat adjustment

ABS control unit (MK60 ESP pump)

Engine electronics power supply relay

Main relay

Control unit 1 left LED headlight

Control unit 1 for right LED headlight

Lane keeping assist control unit

Left headlight control unit

Right headlight power module

Control unit for electric steering column lock

Access and start authorization control unit

Front passenger airbag off indicator lamp / Airbag control unit

Mechatronic unit DSG gearbox / Selector sensor control unit

Oil level and temperature sender / Start/stop button / ASR and ESP deactivation button / Reversing light switch / High pressure sender / Air quality sensor / Climatronic control unit / Air conditioning control unit / Power supply relay 1 / Power supply relay 2 / AUTO HOLD indicator lamp / AUTO HOLD button / Electrochromic interior mirror / Interior rearview mirror / Left washer nozzle heating resistor / Right washer nozzle heating resistor / Seat occupied recognition control unit

Starter relay 1 [gradual implementation] / Starter relay 2 [gradual implementation] / / Light switch / Brake light switch / Brake pedal switch / Engine control unit / Trailer detector control unit / Electronically controlled damping control unit / ABS control unit / Power steering control unit / Data bus diagnostic interface / Terminal 15 voltage supply relay 2 / Automatic dimming interior mirror relay / Active steering motor

Heating resistor for engine crankcase ventilation system [only for vehicles with diesel engines] / / Air flow meter [only for vehicles with petrol engines] / / Headlight range control unit / Voltage stabiliser / Relay for interior rearview mirror with automatic dimming function / Electromechanical parking brake control unit / Control unit for cornering light and headlight range control / Socket relay / Diagnostic socket, 16-pin / Headlight range control unit / Left headlight range control actuator motor / Right headlight range control actuator motor

Parking aid control unit / Lane change assist control unit / Lane change assist control unit 2

Rear view camera control unit

Head unit/radio tuner / TV tuner / Internet access control unit / Chip card reader control unit

Onboard power supply control unit / Voltage stabilizer / Engine control unit

ABS control unit / Air conditioning control unit / Climatronic control unit / Vehicle location system interface control unit

Selector

Interior monitoring system sensor / Alarm siren

Light switch / Rain and light sensor / Electromechanical parking brake indicator lamp / Diagnostic socket, 16-pin / Front roof module / Air humidity sensor

Relay for reducing agent dosing system

Fuse 1 in fuse box C / Fuse 2 in fuse box C / Fuse 4 in fuse box C / Fuse 5 in fuse box C / Fuse 6 in fuse box C

Rear window wiper motor

Starter relay 1 / Starter relay 2

Electronic information system control unit 1 / Head unit/radio tuner [only for vehicles with radio installation]

Electronic information system control unit 1 [only for vehicles with MMI]

Fuse 18 in fuse box C / Fuse 17 in fuse box C

CD changer

Display for front control, display and information unit

Control unit for instrument cluster

Relay for interior rearview mirror with automatic dimming function

Socket / Cigarette lighter

12V socket 2 / 12V socket

Relay 2 power supply terminal 15

Trailer recognition control unit

Trailer recognition control unit

Trailer recognition control unit

Headlight cleaning system relay / Headlight washer pump

Rear window heating relay / Rear window heating element

Electromechanical parking brake control unit

Trailer power supply relay

All-wheel drive control unit [5 cylinders] [4 cylinders]

Rear lid control unit

Fuel pump relay [only for vehicles with diesel engines] / Fuel pump control unit [only for vehicles with diesel engines]

Contact X relief relay / Fresh air fan control unit / Fresh air fan

Electromechanical parking brake control unit

Onboard power supply control unit (footwell lighting, terminal 30G, terminal 58d, luggage compartment lighting) / Hazard warning light indicator lamp / Fuel pump relay

Climatronic control unit (front seat heating with automatic air conditioning) / Front seat heating control unit (front seat heating with manual air conditioning)

Sliding sunroof control unit

Sunroof roller blind control unit

Electronic damping control unit

Control unit for special vehicles [only for vehicles with driver assistance] / / Relay 1 power supply [only for vehicles with driving training equipment]

Relay 2 power supply [only for vehicles with driving training equipment]