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Mazda · Known Issues

2003 Mazda Mazda6 Problems: 4 Known Issues

2003 model year · 3,200+ owner reports · Updated September 2026

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Issue summary

According to Au7o's analysis of 3,200+ owner reports, the 2003 Mazda Mazda6 has 4 documented known issues, with 2 rated critical. The most serious are Subframe and Underbody Rust / Corrosion ($500-$3,000 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 with published estimates, repair costs range from $250 to $3,000. DIY maintenance guides at au7o.io.

In This Article

  • Mazda6 Body/Panels1
  • Mazda6 Safety/Recalls1
  • Mazda6 Electrical1
  • Mazda6 Suspension1
  • Recalls12
  • FAQ
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In This Article

  • Body/Panels1
  • Safety/Recalls1
  • Electrical1
  • Suspension1
  • Recalls12
  • FAQ

All 4 Known Issues

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ALL YEARS2021202020192018201720162015201420132012201120102009200820072006200520042003
Community reported
3,200 owners

On the 2003-2015 Mazda Mazda6, 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 extended warranty coverage for subframe replacement in some regions.

Common Symptoms

  • Visible rust on subframe and underbody components
  • Clunking noises from rear suspension due to weakened mounts
  • Failed safety inspection due to structural corrosion
  • Rear suspension alignment cannot be maintained

How to Fix

Subframe replacement if corrosion is severe. Mazda offered a recall/extended coverage program for subframe replacement (09-007/15). Rust-proofing and undercoating on less-affected vehicles can prevent further deterioration.

Owner tips & cautions

  • TipCheck with Mazda dealer for extended warranty/goodwill coverage on subframe replacement
  • TipAnnual undercoating is essential in salt-belt regions - Mazda6Club.com rust mega-thread
Typical repair cost:$500 - $3,000

Research This Issue

Based on 3,200 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerified3,200 owner reportsLast reported by owners Jun 2024Reviewed Feb 2026

On the 2003-2013 Mazda Mazda6, 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 under a 'Do Not Drive' warning because test data shows a far higher rupture risk than other recalled Takata inflators. Some vehicles initially repaired with like-for-like Takata parts were recalled a second time for a final redesigned inflator.

Common Symptoms

  • Airbag warning light illuminated or flashing
  • Vehicle appears on NHTSA Do Not Drive recall list
  • Recall notice received by mail

How to Fix

Free recall repair at a Mazda dealer replaces the defective inflator with a redesigned part. Owners should check their VIN at NHTSA and not drive the vehicle until the repair is completed if it is under a Do Not Drive advisory.

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Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerifiedReviewed Jun 2026

On the 2003-2008 Mazda Mazda6, 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, battery warning light, and eventually a dead battery. The 3.0L V6 alternator is particularly prone due to its location near exhaust heat.

This issue also affects: Mazda CX-60, Mazda CX-50, Mazda CX-70

Common Symptoms

  • Battery warning light on dashboard
  • Dimming headlights at idle
  • Electrical accessories cutting out
  • Battery keeps dying
  • Whining noise from alternator area

How to Fix

Replace the alternator with a new or quality remanufactured unit. Avoid cheap rebuilds as they tend to fail again quickly. Test the battery and replace if it has been deeply discharged. Inspect the serpentine belt and tensioner during the service. For 3.0L models, consider adding a heat shield if the replacement unit does not include one.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Duralast Gold new alternator 13996N
    OEMDuralast Gold 13996N

    2003-2005 Mazda6 2.3L automatic-transmission 90A branch after charging diagnosis Fitment/availability: The inspected direct page is a live Duralast Gold 13996N product with Add to Cart at $291.99 plus core. Manufacturer/interchange fitme…

    AutoZone
  • Duralast Gold new alternator 11005N
    OEMDuralast Gold 11005N

    2003-2005 Mazda6 2.3L manual-transmission 90A branch after charging diagnosis Fitment/availability: The inspected direct page is a live Duralast Gold 11005N product with Add to Cart at $235.99 plus core. Application data identifies Leste…

    AutoZone
  • Duralast Gold new alternator DLG15582
    OEMDuralast Gold DLG15582

    2006-2008 Mazda6 2.3L naturally aspirated 100A branch after charging diagnosis Fitment/availability: The inspected direct page is a live Duralast Gold DLG15582 product with Add to Cart at $399.99 plus core. TYC/MPA interchange data maps …

    AutoZone
  • Duralast Gold new alternator DLG11007
    OEMDuralast Gold DLG11007

    2003-2008 Mazda6 3.0L V6 110A branch after charging diagnosis Fitment/availability: The inspected direct page is a live Duralast Gold DLG11007 product with Add to Cart at $289.99 plus core. Application and interchange data identifies 110…

    AutoZone

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$300 - $700

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence

On the 2003-2008 Mazda Mazda6, 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-edge wear, and a wandering feel at highway speeds. This issue accelerates in climates with road salt and temperature extremes.

This issue also affects: Mazda Mazda3

Common Symptoms

  • Clunking from rear over bumps
  • Rear-end feels loose or wandering
  • Inner-edge rear tire wear
  • Thumping during hard braking
  • Unstable feeling in highway curves

How to Fix

Replace the rear trailing arm bushings. Press out the old bushings and install new OEM or polyurethane replacements. Some owners replace the entire trailing arm assembly if the bushing press is not available. A rear alignment is required after bushing replacement. Budget 2-3 hours of labor per side.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • MOOG rear trailing-arm bushing K201425
    OEMMOOG K201425

    Rear trailing-arm bushing after physical inspection localizes play or separation to that bushing Fitment/availability: The inspected direct page identifies MOOG K201425 as a rear trailing-arm bushing for the 2003-2008 Mazda6, shows selec…

    PartsGeek

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$250 - $600

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence
NHTSA Recalls12 recalls

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.

Campaign #17V39300022/06/2017

ELECTRICAL SYSTEM:ALTERNATOR/GENERATOR/REGULATOR

Mazda North America Operations (Mazda) is recalling certain model year 2014 Mazda3 vehicles manufactured June 12, 2013, through December 18, 2013, and model year 2014-2015 Mazda6 vehicles manufactured May 20, 2013, through December 4, 2013, and both equipped with a 2.5L engine and a regenerative engine braking system. When driving the affected vehicles in heavy rain or in deep puddles, the alternator belt may slip causing the Power Control module (PCM) to incorrectly assume failure of the charging system.

Campaign #14V17300003/04/2014

TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS

Mazda North American Operations (Mazda) is recalling certain model year 2014-2015 Mazda6 vehicles manufactured October 25, 2012, to October 10, 2014. If the pressures of four of the tires on an affected vehicle gradually drop at the same time, the tire pressure monitoring system (TPMS) may not warn the driver of the drop in pressure. As such, these vehicles fail to comply with the requirements of the Federal Motor Vehicle Safety Standard (FMVSS) No. 138, "Tire Pressure Monitoring System."

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Other Mazda Models

Mazda CX-530Mazda CX-6027Mazda CX-5026Mazda MX-5 Miata22Mazda MX-621Mazda Mazda319

Frequently Asked Questions

What are the most common Mazda Mazda6 problems?

According to Au7o's analysis of 3,200+ owner reports, the 2003 Mazda Mazda6 has 4 documented issues. The most frequently reported are: Subframe and Underbody Rust / Corrosion, Takata Passenger Airbag Inflator Rupture (Do Not Drive), Alternator Premature Failure and Charging System Issues. Of these, 2 are rated critical and should be addressed promptly.

Is the Mazda Mazda6 reliable?

The 2003 Mazda Mazda6 has 4 known issues documented across 3,200+ owner reports. 2 issues are rated critical: Subframe and Underbody Rust / Corrosion 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 $250 to $3,000, 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 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 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.

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.

Data sourced from 3,200+ owner reports, NHTSA recalls, TSBs, and automotive forums.

Campaign #14V67500027/10/2014

AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE

Mazda North American Operations (Mazda) is recalling certain 2014-2015 Mazda CX-9 vehicles sold, or ever registered in the states of Alabama, California, Florida, Georgia, Hawaii, Louisiana, Mississippi, South Carolina, Texas, Puerto Rico, American Samoa, Guam, the Northern Mariana Islands (Saipan), and the U.S. Virgin Islands or "Zone A." Additionally, unless covered in "Zone A," Mazda is recalling certain 2011-2013 Mazda6, 2011-2012 CX-7, and 2011-2015 CX-9 sold, or ever registered in the states of Arizona, Arkansas, Delaware, Illinois, Indiana, Kansas, Kentucky, Maryland, Missouri, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia, West Virginia and the District of Columbia, or "Zone B." Additionally, unless covered in Zone A or Zone B, Mazda is recalling certain 2010-2013 Mazda6, 2010-2012 CX-7, and 2010-2015 CX-9 vehicles ever registered in the states of Alaska, Colorado, Connecticut, Idaho, Iowa, Maine, Massachusetts, Michigan, Minnesota, Montana, New Hampshire, New York, North Dakota, Oregon, Rhode Island, South Dakota, Utah, Vermont, Washington, Wisconsin, and Wyoming or "Zone C." These vehicles are equipped with certain air bag inflators assembled as part of the passenger frontal air bag modules used as original equipment or replacement equipment. In the event of a crash necessitating deployment of the passenger frontal air bag, these inflators may explode due to propellant degradation occurring after long-term exposure to absolute humidity and temperature cycling.

Campaign #18V71700012/10/2018

FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY

Mazda North America Operations (Mazda) is recalling certain model year 2014 Mazda6 vehicles manufactured October 25, 2012, through May 9, 2013. In the affected vehicles, it is possible to fill the fuel tank beyond its rated capacity.

Campaign #14V17000003/04/2014

+ 7 more recalls. Check all on NHTSA.gov

Enter your VIN at NHTSA.gov to check recalls specific to your vehicle.

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 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.