2019 Mazda 3 service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.
Designed for technicians and DIY owners, this manual helps you diagnose issues correctly, follow proven repair steps, and use wiring diagrams and system sections to track faults faster.
What’s included
- Step-by-step repair procedures and service information
- Specifications and reference data (where provided)
- Electrical diagnostics with wiring diagrams
- Coverage across major systems: engine, transmission/driveline, brakes, steering, suspension, HVAC, and more
Trims covered
- I Sport Hatchback 4-Door
- Base Sedan 4-Door
- i Sedan 4-Door
- Base Hatchback 4-Door
- i Grand Touring Sedan 4-Door
- GS Sedan 4-Door
- i Grand Touring Hatchback 4-Door
- GT Sedan 4-Door
- I Sport Sedan 4-Door
- GX Sedan 4-Door
Engines covered
- 2.5L 2488CC 152Cu. In. l4 GAS DOHC Naturally Aspirated
- 2.0L 1998CC 122Cu. In. l4 GAS DOHC Naturally Aspirated
Index / Table of contents
- Body
- Brakes
- Chassis Electrical
- Driveline
- Engine Cooling
- Engine Electrical
- Engine Mechanical
- Engine Performance & Emission Controls
- Fuel System
- General Information & Identification
- Heating, Ventilation, & Air Conditioning
- Hybrid & Electric Vehicle Systems
- Steering
- Suspension
- Transmission, Clutch, & Transfer Case
- Wiring Diagrams
Mazda North American Operations (Mazda) is recalling certain 2019-2020 Mazda3 vehicles. The Smart Brake System (SBS) can falsely detect an obstacle while driving, activating the automatic emergency braking system and suddenly stopping the vehicle.
Stopping the vehicle unexpectedly increases the risk of a crash.
Mazda will notify owners, and dealers will update the SBS software. In addition, vehicles with certain production dates will receive an instrument cluster software update or replacement and a replacement owner's manual. These repairs will be performed free of charge. The recall began February 14, 2020. Owners may contact Mazda customer service at 1-800-222-5500, Option 4. Mazda's number for this recall is 4219L.
Mazda North American Operations (Mazda) is recalling certain 2018-2019 CX-5, Mazda6, and 2019 Mazda3 vehicles. A software error in the powertrain control module (PCM) may cause the engine to stall.
An unexpected stall increases the risk of a crash.
Mazda will notify owners, and dealers will reprogram the PCM software, free of charge. The recall began August 20, 2019. Owners may contact Mazda customer service at 1-800-222-5500, option 4. Mazda's number for this recall is 3719F.
Mazda North American Operations (Mazda) is recalling certain 2019 Mazda3 vehicles. The seat cover material on both front seats may interfere with the head restraint lock release button, causing it to stick in the release position and not allow the head restraint to lock into place.
Loose head restraints may increase the risk of injury in the event of a crash.
Mazda will notify owners, and dealers will install spacers at the bottom of the lock release buttons on both front seat head restraints, free of charge. The recall began August 20, 2019. Owners may contact Mazda customer service at 1-800-222-5500, option 4. Mazda's number for this recall is 3819F.
Mazda North American Operations (Mazda) is recalling certain 2019 Mazda3 vehicles equipped with manual dimming mirrors. The adhesive between the interior rearview mirror and the housing may not be properly bonded, allowing the mirror to detach from the housing. Note: Vehicles equipped with auto dimming mirrors are not affected by this recall.
Rearward visibility will be reduced without the rearview mirror, increasing the risk of a crash.
Mazda will notify owners, and dealers will replace the interior rearview mirror assembly, free of charge. The recall began September 19, 2019. Owners may contact Mazda customer service at 1-800-222-5500, option 4. Mazda's number for this recall is 3919G.
Mazda North American Operations (Mazda) is recalling certain 2019 Mazda3 vehicles. Due to incorrect programing, the passenger air bag deactivation indicator light may erroneously turn off although the passenger air bag is deactivated. In addition, the seat belt status indicators for both the front passenger seat and/or rear seats may erroneously turn off although the front passenger and/or rear seat belts are unfastened.
Incorrect indicator warning lights may lead the driver and/or passengers to be unaware of deactivated air bags or unfastened seat belts, increasing the risk of injury.
Mazda will notify owners, and dealers will replace the passenger air bag/seat belt status indicator assembly, free of charge. The recall began July 9, 2019. Owners may contact Mazda customer service at 1-800-222-5500, Option 4. Mazda's number for this recall is 3319E.
Mazda North American Operations (Mazda) is recalling certain 2019 Mazda3 vehicles. The lug nuts on all four wheels may loosen, potentially resulting in a wheel detaching from the vehicle.
A wheel separating from the vehicle increases the risk of a crash.
Mazda will notify owners, and dealers will tighten the front and rear wheel lug nuts to the correct specification, free of charge. The recall began July 9, 2019. Owners may contact Mazda customer service at 1-800-222-5500, Option 4. Mazda's number for this recall is 3519F.
This service alert supersedes the previously issued service alert listed below. The changes are noted in Red text. SA-047/25 10/07/25 DESCRIPTION When the Telematics Control Unit (TCU) replacement is necessary due to a failure, use MDARS to
This SA supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-011/25 10/16/25 and 02/27/25 DESCRIPTION Some customers will report that their fuel door (AKA, fuel filler door, fuel lid, and fuel-filler lid) wa
DESCRIPTION Some customers may complain that the seat warmer does not operate when turning the ignition on while the seat is warm but when turning the ignition off then on again, the seat warmer begins to operate appropriately. DTCs B1030:1
DESCRIPTION Some vehicles may require the replacement of a damaged VIN plate or vehicle certification label. To obtain a replacement VIN plate (bulkhead-mounted and visible through the lower-left area of the windshield), contact DAG (Dealer
This Service Alert supersedes the previously issued SA listed below: The changes are noted in Red. SA-011/24 02/12/24, 06/06/24, 07/29/24 DESCRIPTION Mazda has developed factory recommended scheduled maintenance services that support all ma
This Service Alert supersedes the previously issued M-Tip(s) listed below. The changes are noted in Red text. MT-002/19 09/30/19 and 12/19/19 DESCRIPTION If an engine assembly is replaced after a catastrophic internal mechanical failure, cl
This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red. 01-008/23 06/05/23 Some vehicles may exhibit rattling noises from the engine compartment and oil leakage from the drive belt auto tension
Subject: TSB 01-001/26 Warranty and Parts Kit Update INCLUDES: Warranty Extension Program - Special Service Program (SSP) D8 Check Engine Light ON with DTC P0126:00, 2018-2025 CX-5, 2019-2023 Mazda3, 2019-2022 CX-3, 2018-2021 Mazda6, 2020-2
Showing the 8 most recent of 680 technical service bulletins on file with NHTSA.
CAR HAS GIVEN MULTIPLE WARNINGS THAT DRIVER AND SAFETY ASSIST FEATURES ARE DISABLED -- DESPITE NOT BEING ENABLED. CAR ALSO GAVE A CAMERA MALFUNCTION WARNING APPROXIMATELY 1 MINUTE BEFORE SLAMMING ON BRAKES UNEXPECTEDLY AT 35-40MPH AND CAUSING INJURY TO DRIVER;INCIDENT OCCURRED AT CLEAR NIGHT WITH NO OTHER CARS AROUND. CAR CURRENTLY IN SHOP; NO WORD ON WHAT CAUSED THIS OR WHEN IT WILL BE REPAIRED.
THESE ISSUES BEEN HAPPENING SINCE THE SECOND MONTH I OWNED MY 2019 MAZDA 3 HATCHBACK. 1- SUSPENSIONS, THEY'RE VERY ROUGH & HARSH., THEY BOUNCE SO MUCH FOR NO REASON, I DAMAGED ONE TIRE ALREADY WHILE I WAS DRIVING ON I476 NORMAL HIGHWAY WHERE I STEPPED ON NORMAL POTHOLE ENDED UP DAMAGING MY TIRE, SUSPENSIONS ARE REALLY DANGERS ON ALL ROADS. 2- "ADAPTIVE CRUISE CONTROL" THIS FEATURE MANY TIMES ALMOST CAUSED AN ACCIDENT, REAR END SPECIALLY ON HIGHWAYS. FOR SOME REASON IT DOESN'T DETECT THE CAR IN FRONT OF ME WHEN I HAVE AUTO CRUISE ENABLED, NO RAIN CLEAR WEATHER, THIS BEEN REPORTED MORE THAN 5
JAN. 23, 2020. 10:45 AM. I WAS ON MY STREET, A NARROW RESIDENTIAL STREET, PREPARING TO BACK IN MY GARAGE. IN ORDER TO DO THAT ON THIS NARROW STREET, I TOUCHED THE LIP OF THE DRIVEWAY ACROSS THE STREET. SPEED WELL UNDER 3 MPH. WHEN I DID SO, MY CAR SUDDENLY SHARPLY ACCELERATED AND AT THE SAME TIME SWERVED TO THE RIGHT. THE ACCELERATION AND SWERVE DROVE THE CAR INTO THE TOWNHOUSES ACROSS THE STREET FROM MY HOUSE. THE DRIVEWAYS ARE VERY SHORT, BARELY A CAR'S LENGTH. AFTER CRASHING, I COULD FEEL THE CAR STILL ACCELERATING. I QUICKLY SWITCHED THE CAR INTO PARK AND THE SPONTANEOUS ACCELERATION CO
TL* THE CONTACT OWNS A 2019 MAZDA 3. THE CONTACT STATED THAT THE VEHICLE FAILED TO IMMEDIATELY ACCELERATE AFTER THE BRAKE ASSIST WAS ENGAGED. AS A RESULT, THE CONTACT'S VEHICLE WAS REAR ENDED BY ANOTHER VEHICLE. THE AIR BAGS DID NOT DEPLOY. A POLICE REPORT WAS NOT FILED AND THERE WERE NO INJURIES SUSTAINED. THE VEHICLE WAS NOT TAKEN TO A DEALER OR INDEPENDENT MECHANIC FOR DIAGNOSTIC TESTING OR REPAIRS. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 7,000.
1. What component or system failed or malfunctioned, and is it available for inspection upon request? The airbag system, specifically the curtain airbags and related airbag control components, malfunctioned by deploying spontaneously without any collision or impact. The vehicle and deployed airbags are still available and can be inspected upon request. 2. How was your safety or the safety of others put at risk? The spontaneous deployment of all four curtain airbags created an immediate safety hazard. Airbag deployment can cause injury, disorientation, or loss of control, especially if it occur
Driver side door handle failed. Cannot enter or exit through driver side door. If something were to happen that we need to get out in an emergency situation we cannot exit through the driver side door. No damage occurred. Just stopped working
To whom it may concern, I was on a back road late in the evening not far from home [XXX] and a small deer ran into the road. I needed to brake to avoid hitting the deer. After breaking, a Brake System Malfunction warning message and i-ACTIVESENSE System Malfunction warning illuminated on my dashboard. I brought the car to a Mazda dealership the next morning. The technician determined that the brake fluid level sensor became stuck, requiring replacement of the brake fluid reservoir and the brake fluid level sensor. What failed: The repairs include replacement of the Brake Fluid Reservoir an
The seat belt stopped retracting and no longer works, it was reported directly to the Mazda agency, but the warranty was not valid. The dealer said that the tensioners no longer work and the seat belt needs to be replaced.
Showing the 8 most serious of 72 complaints filed with NHTSA.
