Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2021 Mazda 3 BaseFACTORY OEM SERVICE PROCEDURE
Repair and Diagnosis
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Quick Lookups
- Accessories & Equipment
- Anti-Theft Systems
- Collision/Avoidance
- I-ACTIVSENSE (Service Information)
- Instrumentation/Driver Info
- On-Board Diagnostic - 360DEGREES View Monitor Control Module
- On-Board Diagnostic - Driver Monitoring Camera Unit
- On-Board Diagnostic - Forward Sensing Camera
- On-Board Diagnostic - Front Radar Sensor
- On-Board Diagnostic - Front Side Radar Sensor
- On-Board Diagnostic - Parking Assist Unit (Optical)
- On-Board Diagnostic - Parking Assist Unit (Ultrasonic)
- On-Board Diagnostic - Rear Side Radar Sensor
- On-Board Diagnostic - Vehicle Control Module (1 Of 2)
- On-Board Diagnostic - Vehicle Control Module (2 Of 2)
- Symptom Troubleshooting - 360DEGREES View Monitor System
- Symptom Troubleshooting - Blind Spot Monitoring System
- Symptom Troubleshooting - Distance And Speed Alert (DSA)
- Symptom Troubleshooting - Driver Attention Alert System
- Symptom Troubleshooting - Driver Monitoring (Dm)
- Symptom Troubleshooting - Front Cross Traffic Alert (FCTA)
- Symptom Troubleshooting - Lane Departure Warning System (LDWS)
- Symptom Troubleshooting - Lane-Keep Assist System
- Symptom Troubleshooting - MAZDA Radar Cruise Control (MRCC) System
- Symptom Troubleshooting - Parking Assist System
- Symptom Troubleshooting - Rear Cross Traffic Alert (RCTA)
- Symptom Troubleshooting - Smart Brake Support (Rear Crossing) (SBS-RC)
- Symptom Troubleshooting - Smart Brake Support (Rear) (SBS-R)
- Symptom Troubleshooting - Smart Brake Support (SBS)
- Symptom Troubleshooting - Traffic Sign Recognition System (TSR)
- Communication Devices
- Body Control System
- On-Board Diagnostic - Body Control Module (BCM) (1 Of 2)
- On-Board Diagnostic - Body Control Module (BCM) (2 Of 2)
- On-Board Diagnostic - Door-Electrical Supply Unit
- On-Board Diagnostic - HS/Ms - Can
- On-Board Diagnostic - LF Control Unit
- On-Board Diagnostic - Telematics Communication Unit
- Symptom Troubleshooting - Telematics Communication System
- Cruise Control Systems
- Drivers Assistance Systems - ADAS
- I-ACTIVSENSE (Service Information)
- Instrumentation/Driver Info
- On-Board Diagnostic - 360DEGREES View Monitor Control Module
- On-Board Diagnostic - Driver Monitoring Camera Unit
- On-Board Diagnostic - Forward Sensing Camera
- On-Board Diagnostic - Front Radar Sensor
- On-Board Diagnostic - Front Side Radar Sensor
- On-Board Diagnostic - Parking Assist Unit (Optical)
- On-Board Diagnostic - Parking Assist Unit (Ultrasonic)
- On-Board Diagnostic - Rear Side Radar Sensor
- On-Board Diagnostic - Vehicle Control Module (1 Of 2)
- On-Board Diagnostic - Vehicle Control Module (2 Of 2)
- Symptom Troubleshooting - 360DEGREES View Monitor System
- Symptom Troubleshooting - Blind Spot Monitoring System
- Symptom Troubleshooting - Distance And Speed Alert (DSA)
- Symptom Troubleshooting - Driver Attention Alert System
- Symptom Troubleshooting - Driver Monitoring (Dm)
- Symptom Troubleshooting - Front Cross Traffic Alert (FCTA)
- Symptom Troubleshooting - Lane Departure Warning System (LDWS)
- Symptom Troubleshooting - Lane-Keep Assist System
- Symptom Troubleshooting - MAZDA Radar Cruise Control (MRCC) System
- Symptom Troubleshooting - Parking Assist System
- Symptom Troubleshooting - Rear Cross Traffic Alert (RCTA)
- Symptom Troubleshooting - Smart Brake Support (Rear Crossing) (SBS-RC)
- Symptom Troubleshooting - Smart Brake Support (Rear) (SBS-R)
- Symptom Troubleshooting - Smart Brake Support (SBS)
- Symptom Troubleshooting - Traffic Sign Recognition System (TSR)
- Entertainment Systems
- Exterior Lights
- Gauges & Instrument Panels
- Headlights
- Horns
- Infotainment
- Interior/Exterior Trim
- Interior/Illumination Lights
- Memory Modules
- Glass/Windows/Mirrors
- Seats
- Window Motors & Regulators
- Wiper/Washer Systems
- Body & Frame
- Brakes
- Drivelines & Axles
- Electrical
- Engine Mechanical
- Engine Performance
- Emissions
- Engine Control Systems
- Fuel Delivery
- Ignition System (VIN 7 & VIN L)
- Mode 6 - 1999-2023 MAZDA
- Specifications
- System
- On-Board Diagnostic - Engine Control System (VINS 7, L, M) (1 Of 4)
- On-Board Diagnostic - Engine Control System (VINS 7, L, M) (2 Of 4)
- On-Board Diagnostic - Engine Control System (VINS 7, L, M) (3 Of 4)
- On-Board Diagnostic - Engine Control System (VINS 7, L, M) (4 Of 4)
- On-Board Diagnostic - Engine Control System (VINS 7, L, M) (Introduction)
- Symptom Troubleshooting - Engine (VINS 7, L, M)
- Testing & Diagnosis
- On-Board Diagnostic - Engine Control System (VINS 7, L, M) (1 Of 4)
- On-Board Diagnostic - Engine Control System (VINS 7, L, M) (2 Of 4)
- On-Board Diagnostic - Engine Control System (VINS 7, L, M) (3 Of 4)
- On-Board Diagnostic - Engine Control System (VINS 7, L, M) (4 Of 4)
- On-Board Diagnostic - Engine Control System (VINS 7, L, M) (Introduction)
- Symptom Troubleshooting - Engine (VINS 7, L, M)
- Tune-Up
- General Information
- Abbreviations
- Basic Trouble Shooting
- Brakes
- Check Lists
- Driveline/Axles
- DTC Index
- Electrical
- Engine
- Engine Performance
- Electrostatic Discharge Warning - General Information
- Engine Performance Diagnostic Routine Outline - General Information
- Engine Performance Safety Precautions
- Map - Engine Performance & Maintenance
- Parasitic Load Explanation & Test Procedures - General Information
- State Emission Standards - Diesel
- State Emission Standards - Gas
- Waveforms - Injector Pattern Tutorial - General Information
- Map - Exhaust Systems
- Heating, Ventilation & A/C (HVAC)
- Hoist/Jack
- Identification
- Metric Conversions
- OEM General Information
- Maintenance Reminder Light (Reset Procedures)
- Specifications Index
- Steering
- Towing
- Traction Control Disable Procedures
- Trouble Shooting - Manual Transmission - General Information
- Heating, Ventilation & A/C (HVAC)
- Maintenance
- Restraints
- Steering
- Suspension
- Transmission
- External Pages
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
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