What is the 2003-2015 Mazda Mazda6 Subframe and Underbody Rust / Corrosion?

First and second generation Mazda6 models are prone to severe underbody rust, particularly in the rear subframe, control arm mounting points, and rocker panels. Road salt accelerates corrosion to the point where structural integrity is compromised. Mazda issued TSB 09-007/15 and… Repairs typically run $500-$3,000. Severity: high.

What is the 2009-2021 Mazda Mazda6 Variable Valve Timing (VVT) Actuator Failure?

The exhaust-side VVT actuator (cam phaser) fails due to oil sludge and wear, causing timing codes and engine rattle. The actuator solenoid can also stick, leading to incorrect valve timing. Oil change neglect accelerates failure. Common on both MZR and early SkyActiv 2.5L engines… Repairs typically run $400-$1,200. Severity: high.

What is the 2014-2015 Mazda Mazda6 Rear Parking Brake Caliper Corrosion / Sticking (Recall 1217F / 17V393)?

Due to inadequate sealing of the rear brake caliper protective boot, water can enter the caliper and corrode the parking brake actuator shaft, particularly in cold and wet climates. The corrosion increases the shaft diameter and inhibits its sliding motion. In extreme cases the s… Severity: high.

What is the 2009-2016 Mazda Mazda6 Front Subframe / Cross Member Corrosion (Recall 19V323 for 2011-2013)?

Mazda6 sedans have a history of corrosion at the front cross member where two suspension components connect, caused by insufficient paint coverage. Severe rust can weaken the connection and cause steering alignment to change unexpectedly. 2011-2013 models in salt-belt states were… Severity: high.

What is the 2018 Mazda Mazda6 Low-Pressure Fuel Pump Impeller Cracking / Engine Stall (Recall 21V875 / 5321K)?

The impeller inside the low-pressure fuel pump on 2018 Mazda6 vehicles (built April-October 2018) was made with inadequate material that can crack and deform under certain conditions. The deformed impeller causes the fuel pump to fail, leading to a no-start condition or an engine… Severity: high.

What is the 2018-2021 Mazda Mazda6 SkyActiv-G 2.5T Turbo Cylinder Head Cracking / Coolant Leak?

A proposed class action alleges that the turbocharged SKYACTIV-G 2.5T engine in 2018-2021 Mazda6 (and other Mazda models) has a structural weakness in the cylinder head near the exhaust manifold. Cracks can develop at the stud bolt hole or the outside of the exhaust manifold, all… Repairs typically run $2,000-$6,000. Severity: high.

What is the 2009-2013 Mazda Mazda6 Front Lower Control Arm Ball Joint Premature Wear?

Second-generation Mazda6 models are known for premature front lower control arm ball joint wear, sometimes as early as 40,000-60,000 miles. The ball joint boots crack and allow grease to escape and moisture to enter, accelerating wear. A failed ball joint is a serious safety conc… Repairs typically run $300-$800. Severity: high.

What is the 2003-2013 Mazda Mazda6 Takata Passenger Airbag Inflator Rupture (Do Not Drive)?

The passenger-side Takata airbag inflators in 2003-2013 Mazda6 vehicles can degrade over time, especially in high-heat and high-humidity climates. When deployed, the inflator can rupture and spray sharp metal fragments into the cabin. NHTSA has flagged certain Mazda6 model years… Severity: high.

What is the 2009-2021 Mazda Mazda6 Rear Brake Caliper Seizing?

Rear brake calipers seize due to corrosion of slide pins and the integrated parking brake mechanism. Salt-belt vehicles are especially affected. Causes dragging brakes, uneven pad wear, and premature rotor warping. The parking brake cable can also corrode and prevent full caliper… Repairs typically run $250-$650. Severity: medium.

What is the 2014-2021 Mazda Mazda6 Clutch Judder on SkyActiv Manual Transmission?

Manual transmission Mazda6 SkyActiv models experience clutch judder similar to the Mazda3 issue. The dual-mass flywheel and clutch disc friction material cause shuddering during engagement, especially from a stop. Mazda acknowledged the issue via technical service bulletin. Repairs typically run $900-$2,000. Severity: medium.

What is the 2014-2021 Mazda Mazda6 SkyActiv-G Intake Valve Carbon Buildup (Direct Injection)?

Because the SkyActiv-G direct-injection engine sprays fuel directly into the cylinder, no detergent fuel ever washes the back of the intake valves. Oil vapor drawn through the PCV system bakes onto the hot valve stems and accumulates as hard carbon, typically becoming noticeable… Repairs typically run $300-$600. Severity: medium.

What is the 2014-2021 Mazda Mazda6 EGR Valve Carbon Buildup and Coolant Leak (SkyActiv 2.5L)?

The SkyActiv 2.5L engine in third-generation Mazda6 models uses a cooled EGR system that is prone to carbon buildup and coolant leaks. The EGR valve and cooler accumulate carbon deposits over time, restricting flow and causing rough idle and reduced performance. Additionally, the… Repairs typically run $200-$800. Severity: medium.

What is the 2003-2008 Mazda Mazda6 Rear Trailing Arm Bushing Deterioration?

The rear trailing arm bushings on first-generation Mazda6 models deteriorate and crack with age, causing a noticeable clunking sound from the rear over bumps and during braking. The degraded bushings allow excessive rear axle movement, leading to vague handling, rear tire inner-e… Repairs typically run $250-$600. Severity: medium.

What is the 2003-2008 Mazda Mazda6 Alternator Premature Failure and Charging System Issues?

First-generation Mazda6 models (especially with the 2.3L and 3.0L engines) experience premature alternator failure, often between 60,000-100,000 miles. The internal voltage regulator and rectifier diodes fail, causing undercharging or overcharging. Symptoms include dimming lights… Repairs typically run $300-$700. Severity: medium.

What is the 2014-2021 Mazda Mazda6 Mazda Connect Infotainment Freezing / Reboot Loop?

The Mazda Connect infotainment system in 2014-onward Mazda6 vehicles is prone to freezing, becoming unresponsive, or getting stuck in a reboot loop. On many cars the system shuts down a few minutes after startup due to an internal failure of the connectivity master unit (CMU) har… Repairs typically run $500-$1,500. Severity: medium.

What is the 2009-2013 Mazda Mazda6 Melting / Sticky Dashboard Crash Pad?

On Mazda6 models built roughly 2008-2012, the dashboard crash pad material deteriorates when exposed to high heat and humidity, developing a sticky, glossy surface. The shine can reflect into the windshield and impair visibility, and the sticky residue transfers to anything that… Severity: low.

Mazda · Known Issues

2003-2021 Mazda Mazda6 Problems: 16 Issues Every Owner Should Know

2003-2021 model years · 6,750+ owner reports · Updated June 2026

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According to Au7o's analysis of 6,750+ owner reports, the 2003-2021 Mazda Mazda6 has 16 documented known issues, with 8 rated critical. The most serious are Subframe and Underbody Rust / Corrosion ($500-$3,000 repair), Variable Valve Timing (VVT) Actuator Failure ($400-$1,200 repair), Rear Parking Brake Caliper Corrosion / Sticking (Recall 1217F / 17V393), Front Subframe / Cross Member Corrosion (Recall 19V323 for 2011-2013), Low-Pressure Fuel Pump Impeller Cracking / Engine Stall (Recall 21V875 / 5321K), SkyActiv-G 2.5T Turbo Cylinder Head Cracking / Coolant Leak ($2,000-$6,000 repair), Front Lower Control Arm Ball Joint Premature Wear ($300-$800 repair) and Takata Passenger Airbag Inflator Rupture (Do Not Drive). The most commonly reported issue is Subframe and Underbody Rust / Corrosion with 3,200 owner reports. Across all issues, repair costs range from $200 to $6,000. at .

Frequently Asked Questions

What are the most common Mazda Mazda6 problems?

According to Au7o's analysis of 6,750+ owner reports, the 2003-2021 Mazda Mazda6 has 16 documented issues. The most frequently reported are: Subframe and Underbody Rust / Corrosion, Variable Valve Timing (VVT) Actuator Failure, Rear Parking Brake Caliper Corrosion / Sticking (Recall 1217F / 17V393). Of these, 8 are rated critical and should be addressed promptly.

Is the Mazda Mazda6 reliable?

The 2003-2021 Mazda Mazda6 has 16 known issues documented across 6,750+ owner reports. 8 issues are rated critical: Subframe and Underbody Rust / Corrosion and Variable Valve Timing (VVT) Actuator Failure and Rear Parking Brake Caliper Corrosion / Sticking (Recall 1217F / 17V393) and Front Subframe / Cross Member Corrosion (Recall 19V323 for 2011-2013) and Low-Pressure Fuel Pump Impeller Cracking / Engine Stall (Recall 21V875 / 5321K) and SkyActiv-G 2.5T Turbo Cylinder Head Cracking / Coolant Leak and Front Lower Control Arm Ball Joint Premature Wear and Takata Passenger Airbag Inflator Rupture (Do Not Drive). 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.

How much does it cost to fix common Mazda Mazda6 problems?

Repair costs for known Mazda Mazda6 issues range from $200 to $6,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Subframe and Underbody Rust / Corrosion, typically costs $500-$3,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What year Mazda Mazda6 is the most reliable?

Reliability varies across model years of the Mazda Mazda6. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2003-2021 Mazda Mazda6 with 16 documented issues documented across 6,750+ owner reports.

All 16 Known Issues

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Frequently Asked Questions

What are the most common Mazda Mazda6 problems?

Is the Mazda Mazda6 reliable?

How much does it cost to fix common Mazda Mazda6 problems?

What year Mazda Mazda6 is the most reliable?

2009-2021 Mazda Mazda6: Variable Valve Timing (VVT) Actuator Failure#

2018-2021 Mazda Mazda6: SkyActiv-G 2.5T Turbo Cylinder Head Cracking / Coolant Leak#

2014-2021 Mazda Mazda6: SkyActiv-G Intake Valve Carbon Buildup (Direct Injection)#

2014-2021 Mazda Mazda6: EGR Valve Carbon Buildup and Coolant Leak (SkyActiv 2.5L)#

2009-2016 Mazda Mazda6: Front Subframe / Cross Member Corrosion (Recall 19V323 for 2011-2013)#

2009-2013 Mazda Mazda6: Front Lower Control Arm Ball Joint Premature Wear#

2003-2008 Mazda Mazda6: Rear Trailing Arm Bushing Deterioration#

2014-2015 Mazda Mazda6: Rear Parking Brake Caliper Corrosion / Sticking (Recall 1217F / 17V393)#

2009-2021 Mazda Mazda6: Rear Brake Caliper Seizing#

2003-2015 Mazda Mazda6: Subframe and Underbody Rust / Corrosion#

2018 Mazda Mazda6: Low-Pressure Fuel Pump Impeller Cracking / Engine Stall (Recall 21V875 / 5321K)#

2003-2013 Mazda Mazda6: Takata Passenger Airbag Inflator Rupture (Do Not Drive)#

2003-2008 Mazda Mazda6: Alternator Premature Failure and Charging System Issues#

2014-2021 Mazda Mazda6: Mazda Connect Infotainment Freezing / Reboot Loop#

2014-2021 Mazda Mazda6: Clutch Judder on SkyActiv Manual Transmission#

2009-2013 Mazda Mazda6: Melting / Sticky Dashboard Crash Pad#