Owner’s manual specs

2021 Ford Mustang Specs: Maintenance Schedule & Fuse Box

Figures for the 2021 Ford Mustang, copied from Ford’s own owner’s manual. Every one links to the manual page it came from.

From the manufacturer’s manuals. Every figure here is copied from the manufacturer's own manual, with a link to the page it came from. Where a manual is unclear or contradicts itself, we leave the figure out.

Maintenance schedule

Normal service schedule

Use this for ordinary driving.

Service	When
Change the automatic transmission fluid and filter. Source: Owner’s Manual Printing 2 (PDF), page 446	Every 150,000 mi
Change the engine oil and filter. Source: Owner’s Manual Printing 2 (PDF), page 445	At every oil change interval as indicated by the information display
Replace the cabin air filter. Source: Owner’s Manual Printing 2 (PDF), page 446	Every 20,000 mi(32,000 km)
Replace the engine air filter. Source: Owner’s Manual Printing 2 (PDF), page 446	Every 30,000 mi(48,000 km)

Severe service schedule

Use this if you tow, idle a lot, drive short trips in the cold, or run in dust.

Service	When
Change engine oil and filter as indicated by the information display and perform services listed in the Normal Scheduled Maintenance chart. Applies to: Towing a Trailer or Using a Car-top Carrier Source: Owner’s Manual Printing 2 (PDF), page 448	As required
Change engine oil and filter. Applies to: Operating in Dusty or Sandy Conditions Such as Unpaved or Dusty Roads Source: Owner’s Manual Printing 2 (PDF), page 449	Every 5,000 mi(8,000 km)
Inspect engine air filter. Replace as required. Applies to: Extensive Idling or Low-speed Driving for Long Distances, as in Heavy Commercial Use Such as Delivery, Taxi, Patrol Car or Livery Source: Owner’s Manual Printing 2 (PDF), page 448	Every 15,000 mi(24,000 km)
Replace cabin air filter. Applies to: Extensive Idling or Low-speed Driving for Long Distances, as in Heavy Commercial Use Such as Delivery, Taxi, Patrol Car or Livery Source: Owner’s Manual Printing 2 (PDF), page 448	Inspect frequently, service as required

Fuse box locations & fuse chart

Passenger Compartment Fuse Panel

Where to find it

Passenger Compartment Fuse Panel The fuse panel is in the right-hand side of the passenger footwell behind a trim panel and plastic key code card.

To remove the trim panel, lift it from the rear retaining hooks, while pulling it toward you and swinging it away from the side.

Source: Owner’s Manual Printing 1 (PDF), page 251

What each fuse protects

Fuse	Amps	Protects	Source
1	—	Not used	p.252
2	10A	Power windows. Electrochromic mirror. Power door locks.	p.252
3	7.5A	Power mirrors (base). Memory seats (base). Not used (GT500).	p.252
4	20A	Not used (spare)	p.252
5	—	Not used	p.252
6	10A	Not used (spare)	p.252
7	10A	Not used (spare). 252	p.252
8	5A	Telematic control unit - modem	p.253
9	5A	Not used	p.253
10	—	Not used	p.253
11	—	Not used	p.253
12	7.5A	Electronic control panel. Gateway module. Gear shift module (GT500).	p.253
13	7.5A	Steering column control module. Instrument cluster.	p.253
14	15A	Not used	p.253
15	15A	SYNC. Gauges.	p.253
16	—	Not used	p.253
17	7.5A	Headlamp leveling switch (base). Not used (GT500).	p.253
18	7.5A	Not used	p.253
19	5A	Not used	p.253
20	5A	Intrusion sensor module	p.253
21	5A	In-vehicle temperature and humidity sensor	p.253
22	5A	Auxiliary body module	p.253
23	30A	Amplifier	p.253
24	30A	Vehicle dynamics module	p.253
25	20A	Ambient lighting module (base). Auxiliary body module.	p.253
26	30A	Right-hand front-window motor (power distribution module). Passenger door control unit.	p.253
27	30A	Left-hand rear-window power (base). Not used (GT500). 253	p.253
28	30A	Right-hand rear-window power (base). Not used (GT500).	p.254
29	15A	Gateway module (base). Not used (spare) (GT500).	p.254
30	5A	Not used (spare)	p.254
31	10A	Remote keyless entry	p.254
32	20A	Audio unit	p.254
33	—	Not used	p.254
34	30A	Run/start bus	p.254
35	5A	Power distribution box run/start relay (base). Not used (GT500).	p.254
36	15A	Front camera (base). Not used (GT500).	p.254
37	20A	Heated steering wheel module (base). Not used (GT500).	p.254

Power Distribution Box

Where to find it

The power distribution box is in the engine compartment.

Source: Owner’s Manual Printing 1 (PDF), page 245

What each fuse protects

Fuse	Amps	Protects	Source
1	—	Electronic fan 1 (GT500). Not used (base).	p.246
2	—	Not used	p.246
3	—	Electronic fan 1 (base). Not used (GT500).	p.246
4	—	Electronic fan 3 (base). Not used (GT500).	p.246
5	—	Automatic brake system pump	p.246
6	—	Body control module	p.246
7	—	Body control module	p.246
8	—	Body control module	p.246
9	—	Rear window defroster	p.246
10	—	Blower motor	p.246
11	—	Left-hand front window	p.246
12	—	Driver seat	p.246
13	—	Passenger seat	p.246
14	—	Climate controlled seat module	p.246
15	—	Convertible top slave motor (base). Not used (GT500).	p.246
16	—	Charge air cooler pump (GT500). Not used (base). 246	p.246
17	—	Convertible top master motor (base). Not used (GT500).	p.247
18	—	Not used. Steering column lock relay (base).	p.247
19	—	Transmission control unit (GT500)	p.247
20	—	Brake on-off switch	p.247
21	—	Horn	p.247
22	—	Powertrain control module relay	p.247
23	—	Air conditioning clutch	p.247
24	—	Voltage quality module	p.247
25	—	Steering column lock relay (GT500). Not used (base).	p.247
26	—	Windshield wiper motor	p.247
27	—	Not used	p.247
28	—	Automatic brake system valve	p.247
29	—	Not used	p.247
30	—	Starter motor solenoid	p.247
31	—	Not used	p.247
32	—	Latch relay coil. Run/start (base).	p.247
33	—	Left-hand high-intensity discharge head- lamps (GT500)	p.247
34	—	Exhaust valves. 247	p.247
35	—	Right-hand high-intensity discharge head- lamps (GT500). Not used (base).	p.248
36	—	Alternator sense	p.248
37	—	Not used	p.248
38	—	Vehicle power 1	p.248
39	—	Not used	p.248
40	—	Vehicle power 2	p.248
41	—	Fuel injectors	p.248
42	—	Vehicle power 3	p.248
43	—	Not used. Vehicle power 4 (base).	p.248
44	—	Vehicle power 4 (GT500)	p.248
45	—	Not used	p.248
46	—	Differential pump (Mach 1, GT500). Not used (base).	p.248
47	—	Not used	p.248
48	—	Fuel pump #2 (GT500). Not used (base).	p.248
49	—	Fuel pump	p.248
50	—	Steering column lock relay	p.248
51	—	Not used	p.248
52	—	Horn relay	p.248
53	—	Cigar lighter. 248	p.248
54	—	Auxiliary power point	p.249
55	—	Electronic fan 2 (base). Not used (GT500).	p.249
56	—	Not used	p.249
57	—	Air conditioning clutch relay	p.249
58	—	Not used	p.249
59	—	Exhaust valves relay	p.249
60	—	Powertrain control module	p.249
61	—	Not used	p.249
62	—	Anti-lock brakes run/start switch	p.249
63	—	Not used	p.249
64	—	Electronic power assist steering	p.249
65	—	Not used. Blind spot information system. Rear view camera.	p.249
66	—	Rear window defroster relay coils. Vehicle dynamics module.	p.249
67	—	Not used	p.249
68	—	Headlamp leveling switch (base). Signature lighting (GT500).	p.249
69	—	Cigar lighter relay. Auxiliary power point relay.	p.249
74	—	Mass air flow sensor (base). Not used (GT500).	p.249
75	—	Rain sensor module (base). 249	p.249
76	—	Rear window defroster relay	p.250
77	—	Electronic cooling fan 2 relay (base). Not used (GT500).	p.250
78	—	Run/start relay (base). Not used (GT500).	p.250
79	—	Charge air cooler pump relay (GT500). Not used (base).	p.250
80	—	Windshield wiper relay	p.250
81	—	Starter motor solenoid relay	p.250
82	—	Powertrain control module relay	p.250
83	—	Cooling fan relay (GT500). Not used (base).	p.250
87	—	Heated exterior mirrors	p.250
88	—	Not used	p.250
89	—	Electronic fan 1 relay (base). Not used (GT500).	p.250
90	—	Differential pump relay (Mach 1, GT500). Not used (base).	p.250
91	—	Electronic fan 3 relay (base). Not used (GT500).	p.250
92	—	Blower motor relay	p.250
93	—	Fuel pump #2 relay (GT500). 250	p.250
94	—	Fuel pump relay	p.251

More fuse pages in the manual

Diagrams and printed legends we can’t host. Check the box name printed on a diagram before counting positions.

Not on this page

Fluids & capacities: We're still checking these figures.
Oil life & reset procedures: We're still checking these figures.

All Ford repair jobs →

Other Ford Mustang years

← 2020 Ford Mustang specs 2022 Ford Mustang specs →