2021 Mazda 3 Service and Repair Manual

This factory service and repair manual for the 2021 Mazda 3 concerns a year that ran to sixteen trims, the 100th Anniversary Edition, 2.5 Turbo Premium Plus and Signature among them, across a 4-door hatchback and a 4-door sedan. The engines were three gasoline inline-fours with dual overhead camshafts: a 2.0L of 122 cubic inches, a naturally aspirated 2.5L of 152 cubic inches and a turbocharged version of that 2.5L. Turbocharger and fuel system specifications join procedures for the cooling system, transaxle and brakes.

Engines covered

• 2.0L inline-four (122 cu in) — DOHC, naturally aspirated, gasoline
• 2.5L inline-four (152 cu in) — DOHC, naturally aspirated, gasoline
• 2.5L inline-four (152 cu in) — DOHC, turbocharged, gasoline

Body styles covered

• 4-door hatchback
• 4-door sedan

Trims covered

• 100th Anniversary Edition
• 2.0
• 2.5 S
• 2.5 Turbo
• 2.5 Turbo Premium Plus
• GS
• GT
• GX
• i
• i Grand Touring
• I Sport
• Preferred
• Premium
• s Grand Touring
• Select
• Signature

Known issues on the 2021 Mazda 3. The single recall on the 2021 Mazda 3 concerns its tire valves. On certain 2021 Mazda 3 vehicles, air could escape suddenly through a tire valve, and the resulting deflation could cost the driver control; dealers fitted four new tire valves. NHTSA also holds 49 owner complaints, with the engine named in 18 and forward collision avoidance in 7; 2 complaints reported a crash and 2 a fire. The manual has engine diagnostics and specifications along with procedures for the wheels, tires and brakes.