2018 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated September 2026
2018 · All trims · All engines
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According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2018 Mazda Mazda3 has 3 documented known issues, with 1 rated critical. The most serious is 2018 Mazda3 Denso Low-Pressure Fuel Pump Impeller Cracks - Engine Stall (Recall 21V875) ($0-$900 repair). Across all issues with published estimates, repair costs range from $300 to $1,800. DIY maintenance guides at au7o.io.
VISIBILITY:WINDSHIELD WIPER/WASHER
Mazda North American Operations (Mazda) is recalling certain 2016-2018 Mazda3 vehicles. A defective windshield wiper relay may cause the windshield wipers to become inoperative, reducing the driver's visibility.
FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY
Mazda Motors North American Operations (Mazda) is recalling certain model year 2014-2016 Mazda3 vehicles manufactured January 4, 2014, to September 18, 2015. The fuel tank of the affected vehicles may have been improperly handled during manufacturing and, as a result, the welded attachment of the Inlet Check Valve (ICV) may fail and allow fuel to leak.
FUEL SYSTEM, GASOLINE:STORAGE
Mazda North American Operations (Mazda) is recalling certain model year 2016 Mazda3 vehicles manufactured September 24, 2015, to October 16, 2015. During manufacturing, the fuel tanks for the affected vehicles may have deformed, resulting in a fuel leak from the recirculation pipe welded connection.
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According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2018 Mazda Mazda3 has 3 documented issues. The most frequently reported are: 2018 Mazda3 Denso Low-Pressure Fuel Pump Impeller Cracks - Engine Stall (Recall 21V875), Rear Torsion Beam Bushing Deterioration, 2014-2018 Mazda3 i-ELOOP Capacitor / DC-DC Converter Failure - Charging System Warning and P1794. Of these, 1 is rated critical and should be addressed promptly.
The 2018 Mazda Mazda3 has 3 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 1 issue is rated critical: 2018 Mazda3 Denso Low-Pressure Fuel Pump Impeller Cracks - Engine Stall (Recall 21V875). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
Repair costs for known Mazda Mazda3 issues range from $0 to $1,800, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, 2018 Mazda3 Denso Low-Pressure Fuel Pump Impeller Cracks - Engine Stall (Recall 21V875), typically costs $0-$900 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
The in-tank low-pressure fuel pump supplied by Denso used an impeller molded with too low a density; it absorbs fuel, swells, cracks and deforms, then binds against the pump housing. Fuel delivery drops off, the engine runs lean, hesitates and can stall outright - sometimes at sp… Repairs typically run $0-$900. Severity: high.
Third-generation Mazda3 models with the torsion beam rear suspension develop worn rear axle bushings that cause a vague, wandering rear end and clunking over bumps. The rubber bushings deteriorate from road salt, UV exposure, and age, allowing excess play in the rear axle. This a… Repairs typically run $300-$700. Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
PARKING BRAKE
Mazda North American Operations (Mazda) is recalling certain 2014-2015 Mazda6 and 2014-2016 Mazda3 vehicles. Water could possibly enter the brake caliper causing the parking brake actuator shaft to corrode and possibly bind.
FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY
Mazda North American Operations (Mazda) is recalling certain model year 2015-2016 Mazda3 vehicles manufactured May 21, 2015, to August 25, 2015. The affected vehicles are equipped with a fuel tank with a shut-off valve that can allow fuel to enter into the fuel tank emissions systems. If enough fuel enters the emission system it may leak out onto the ground or result in an engine stall.
+ 4 more recalls. Check all on NHTSA.gov
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On i-ELOOP equipped BM/BN Mazda3s, regenerative braking energy is stored in an electric double-layer capacitor mounted in the engine bay and fed back to the 12V system through a DC-DC converter. The capacitor develops an internal open circuit, or the DC-DC converter fails, and th… Repairs typically run $600-$1,800. Severity: medium.
