The service and repair manual for the 2021 Mazda 3 — 2.5L I4 and 2.5L I4 and 2.0L I4 engines, 24 trims. Matched to this exact model year, so the specifications and sequences are the ones Mazda published for your car, not figures carried over from a neighbouring year.
01 / FitmentWhat this manual covers
| Model year | 2021 |
|---|---|
| Engines | 2.5L I4 — 152 cu in, DOHC, turbocharged 2.5L I4 — 152 cu in, DOHC 2.0L I4 — 122 cu in, DOHC |
| Trims | 2.5 Turbo Hatchback 4-Door · 100th Anniversary Edition Sedan 4-Door · Select Hatchback 4-Door · 2.5 Turbo Premium Plus Hatchback 4-Door · Select Sedan 4-Door · Premium Sedan 4-Door +18 |
| Other 2021 3 variants | 3 Sport → |
| Federal record | 1 recall · 49 complaints · 614 technical service bulletins (refreshed 2026-08-21) |
02 / InsideSample pages from the 2021 3 manual
03 / ContentsSections in the manual
- Quick Lookups 142
- General Information 1,844
- Accessories & Equipment 4,049
- Heating, Ventilation & A/C (HVAC) 686
- Body & Frame 618
- Maintenance 24
- Brakes 725
- Restraints 235
- Drivelines & Axles 144
- Steering 106
- Electrical 1,479
- Suspension 103
- Engine Mechanical 616
- Transmission 353
- Engine Performance 2,228
- Loosen 180
04 / Known issuesRecalls on federal record for the 2021 3
- Tires — valve · 21V101000A sudden air leak from the tire air valve may cause a loss of vehicle control while driving, increasing the risk of a crash.
Owners have filed 49 complaints and Mazda has issued 614 technical service bulletins for the 2021 3. The manual carries the manufacturer's diagnostic and repair procedures behind these systems.
FAQQuestions about the 2021 3 manual
Is this manual specific to the 2021 3?
Yes. It is the OEM manual matched to the 2021 model year, covering the 2.5L I4 and 2.5L I4 and 2.0L I4 across the 2.5 Turbo Hatchback 4-Door, 100th Anniversary Edition Sedan 4-Door, Select Hatchback 4-Door, 2.5 Turbo Premium Plus Hatchback 4-Door, Select Sedan 4-Door, Premium Sedan 4-Door, 2.5 S Sedan 4-Door, I Sport Hatchback 4-Door, 2.0 Sedan 4-Door, GS Sedan 4-Door, Premium Hatchback 4-Door, i Grand Touring Hatchback 4-Door, GT Sedan 4-Door, 2.5 Turbo Sedan 4-Door, Signature Hatchback 4-Door, 2.5 Turbo Premium Plus Sedan 4-Door, Preferred Sedan 4-Door, i Sedan 4-Door, i Grand Touring Sedan 4-Door, 2.5 S Hatchback 4-Door, s Grand Touring Hatchback 4-Door, I Sport Sedan 4-Door, GX Sedan 4-Door, Preferred Hatchback 4-Door trims. Specifications and procedure sequences are the ones Mazda published for this year.
What 2021 3 problems does it help with?
1 recall is on federal record for the 2021 3, covering tires. The manual carries the manufacturer's diagnostic and repair procedures for those systems; the recall repairs themselves are done free by Mazda dealers.
Does it include 2021 3 wiring diagrams?
Yes — the complete wiring diagrams for the 2021 build, alongside repair procedures, specifications and diagnostics.
Is it a subscription?
No. $49.99 once and the manual is yours. It is a digital manual — nothing ships; access details arrive by email after checkout and it works on any device.
RelatedOther 3 years and 2021 Mazda models
2024 3 · 2023 3 · 2022 3 · 2020 3 · 2019 3 · 2018 3 · 2017 3 · 2016 3 · 2015 3 · all 21 years
2021 Mazda 2 · 2021 Mazda 3 Sport · 2021 Mazda 6 · 2021 Mazda CX-3 · 2021 Mazda CX-30 · 2021 Mazda CX-5 · 2021 Mazda CX-9 · 2021 Mazda MX-5 · 2021 Mazda MX-5 Miata · every 2021 model