The vehicle dossier US · 2008

2008 Mazda
CX-9Problems & recalls

172 distinct owner reports in the NHTSA snapshot. Suspension appears in 55 of them. Explore what was reported—and which official actions are on file.

Snapshot Sep 28, 2026Live NHTSA complaint API How this dossier is compiled

01 / Owner-reported evidence

What owners reported.

Categories attached to 172 distinct reports. A report can mention more than one component, so category totals can overlap.

Suspension55 reports
Other components43 reports
Brakes30 reports
Air bags28 reports
Transmission & drivetrain27 reports
Steering19 reports
Electrical system13 reports
Engine7 reports
Visibility3 reports
Fuel system2 reports
Body & structure1 reports
See original component labels
SUSPENSION54
AIR BAGS27
POWER TRAIN25
SERVICE BRAKES23
STEERING18
WHEELS16
ELECTRICAL SYSTEM13
UNKNOWN OR OTHER11
SERVICE BRAKES, HYDRAULIC7
SEATS6
ENGINE6
VEHICLE SPEED CONTROL3
POWER TRAIN:AUTOMATIC TRANSMISSION2
TRACTION CONTROL SYSTEM2
SUSPENSION:FRONT:CONTROL ARM:LOWER BALL JOINT2
ELECTRONIC STABILITY CONTROL (ESC)2
VISIBILITY:WINDSHIELD1
SEATS:FRONT ASSEMBLY:HEAD RESTRAINT1
AIR BAGS:FRONTAL1
TIRES:PRESSURE MONITORING AND REGULATING SYSTEMS1
LATCHES/LOCKS/LINKAGES1
SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:MASTER CYLINDER1
STEERING:LINKAGES:TIE ROD ASSEMBLY1
VISIBILITY:SUN/MOON ROOF ASSEMBLY1
ENGINE AND ENGINE COOLING1
STRUCTURE:BODY1
FUEL SYSTEM, GASOLINE:FUEL INJECTION SYSTEM:FUEL RAIL1
SEAT BELTS1
POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT1
FUEL/PROPULSION SYSTEM1
VISIBILITY/WIPER1
LANE DEPARTURE: BLIND SPOT DETECTION1
EQUIPMENT:APPLIANCE:AIR CONDITIONER1

These are reports made to NHTSA, not verified diagnoses. More reports can reflect more vehicles, more time on the road, or greater reporting activity.

The reporting timeline

When reports arrived.

Reports by year filed, not by the year a problem occurred. Showing the latest 15 years with reports.

Year filed (last two digits)Latest report: Jun 12, 2024
Mileage, where supplied

101,000 miles is the median among 127 reports with usable mileage. The middle half spans 60,000–126,157 miles.

This describes the submitted reports. It does not predict when a vehicle will fail.

02 / Official safety campaigns

6 recall campaigns on file.

A campaign can cover only certain production dates or configurations. The count does not tell you whether an individual car has an open recall.

Oct 31, 2019 Safety recallAIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULECampaign 19V782000

A do-not-drive advisory is recorded. Verify applicability immediately with NHTSA or the manufacturer.

Reported concern

Mazda North American Operations (Mazda) is recalling certain 2007-2012 CX-7, CX-9, and 2009-2012 Maza6 vehicles. These vehicles had their passenger frontal air bag inflators previously replaced under a prior recall using inflators of the same design. The inflators may explode due to propellant degradation occurring after long-term exposure to high absolute humidity, temperature and temperature cycling.

Manufacturer’s stated response

Owners are advised not to drive their vehicles until the repair has been performed. Mazda will notify owners, and dealers will replace the front passenger air bag inflator with an alternate one, free of charge. The recall began December 3, 2019. Owners may contact Mazda customer service at 1-800-222-5500, option 4. Mazda's number for this recall is 1317F. Note: This recall supersedes recalls 16V356 and 17V012.

Manufacturer campaign: 1317F

Read campaign 19V782000 at NHTSA
Jul 18, 2017 Safety recallAIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULECampaign 17V457000

A do-not-drive advisory is recorded. Verify applicability immediately with NHTSA or the manufacturer.

Reported concern

Mazda North America Operations (Mazda) is recalling certain 2012 CX-7, CX-9 and Mazda6 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 included in "Zone A" above, Mazda is recalling certain 2009 CX-7, CX-9 and Mazda6 vehicles sold, or ever registered in the states of Arizona, Arkansas, Delaware, District of Columbia, Illinois, Indiana, Kansas, Kentucky, Maryland, Missouri, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia, and West Virginia, or "Zone B." Additionally, unless included in "Zone A" or "Zone B" above, Mazda is recalling certain 2007-2008 CX-7 and CX-9 sold, or 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. 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 rupture due to propellant degradation occurring after long-term exposure to absolute humidity and temperature cycling.

Manufacturer’s stated response

Owners are advised not to drive their vehicles until the remedy is performed. Mazda will notify owners, and dealers will replace the front passenger side air bag inflator with an alternate inflator, free of charge. The recall began October 4, 2017. Owners may contact Mazda customer service at 1-800-222-5500. Mazda's number for this recall is 1317F. Note: This recall supersedes recall 17V-012.

Manufacturer campaign: 1317F

Read campaign 17V457000 at NHTSA
Jun 29, 2017 Safety recallAIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULECampaign 17V429000

A do-not-drive advisory is recorded. Verify applicability immediately with NHTSA or the manufacturer.

Reported concern

Mazda North America Operations (Mazda) is recalling certain 2009-2011 Mazda6, and 2007-2011 CX-7 and CX-9 vehicles. These vehicles are equipped with certain air bag inflators assembled as part of the passenger frontal air bag modules, and used as original equipment or replacement equipment. In the event of a crash necessitating deployment of the front air bags, these inflators may rupture due to propellant degradation occurring after long-term exposure to absolute humidity and temperature cycling.

Manufacturer’s stated response

Owners are advised not to drive their vehicles until the remedy is performed. Mazda will notify owners, and dealers will replace the passenger frontal air bag inflator with an alternate inflator, free of charge. The recall began on August 30, 2017. Owners may contact Mazda customer service at 1-800-222-5500. Mazda's number for this recall is 1317F. Note: This recall supersedes recall 16V356 and all vehicles that were not remedied under that campaign are now covered by this one.

Manufacturer campaign: 1317F

Read campaign 17V429000 at NHTSA
Jul 20, 2015 Safety recallSUSPENSION:FRONT:CONTROL ARM:LOWER BALL JOINTCampaign 15V451000

Reported concern

Mazda North American Operations (Mazda) is recalling certain model year 2007-2014 CX-9 vehicles manufactured October 24, 2006, to December 28, 2013. The affected vehicles have front suspension ball joints that may corrode from water leaking into the fitting.

Manufacturer’s stated response

Mazda will notify owners, and dealers will replace both the left and right lower control arms, free of charge. The recall began on September 14, 2015. The recall will begin with model year 2007-2009 vehicles registered in Connecticut, Delaware, Illinois, Indiana, Iowa, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, Virginia, Washington D.C., West Virginia, and Wisconsin. The second phase will be for model year 2010-2014 vehicles in the same states. Finally, all remaining vehicles will be remedied. Owners may contact Mazda customer service at 1-800-222-5500. Mazda's number for this recall is 8515G.

Manufacturer campaign: 8515G

Read campaign 15V451000 at NHTSA
Apr 2, 2009 Safety recallEQUIPMENTCampaign 09E011000

Reported concern

THULE, INC. IS RECALLING 2,323 OWNER-INSTALLED ROOF-MOUNTED FIT KITS, MODELS 3068 AND 3069, MANUFACTURED BETWEEN JANUARY 1, 2008 AND FEBRUARY 28, 2009 THAT ARE USED WITH THULE PODIUM FOOT PACKS, MODELS 460 AND 460R. THESE FIT KITS WERE SOLD AS AFTERMARKET EQUIPMENT FOR USE ON THE VEHICLES LISTED ABOVE. THE BOLT(S) USED TO SECURE THE FOOT TO THE VEHICLE WAS MANUFACTURED TO A HARDNESS THAT MAY CAUSE THE BOLT(S) TO BE BRITTLE AND POTENTIALLY BREAK UNDER STRESS.

Manufacturer’s stated response

THULE WILL MAIL A RETRO FIT KIT ALONG WITH REPAIR INSTRUCTIONS TO OWNERS FREE OF CHARGE. THE SAFETY RECALL IS EXPECTED TO BEGIN ON OR BEFORE APRIL 13, 2009. OWNERS MAY CONTACT THULE TOLL-FREE AT 1-800-238-2388.

Read campaign 09E011000 at NHTSA
Feb 23, 2009 Safety recallELECTRICAL SYSTEM:WIRING:INTERIOR/UNDER DASHCampaign 09V066000

Reported concern

MAZDA IS RECALLING 30,600 MY 2007-2009 CX9 VEHICLES EQUIPPED WITH POWER ADJUSTABLE SEAT WITH POSITION MEMORY FUNCTION. THE SEAT HARNESS ROUTED UNDERNEATH THE SEAT CUSHION MAY INTERFERE WITH THE FRONT COVER BRACKET WHICH IS ATTACHED ON THE FRONT SIDE OF THE SEAT CUSHION. DUE TO THIS THE COVERING OF THE SEAT HARNESS MAY BE DAMAGED, THE CORE WIRE OF THE HARNESS MAY TOUCH WITH THE BRACKET AND RESULT IN SHORT CIRCUIT.

Manufacturer’s stated response

DEALERS WILL INSPECT THE SEAT HARNESS AND FASTEN THE SEAT FRAME WITH A CABLE TIE. THE HARNESS COVERING WILL BE REPAIR FREE OF CHARGE. THE RECALL IS EXPECTED TO BEGIN ON OR BEFORE MARCH 16, 2009. OWNERS MAY CONTACT MAZDA AT 1-800-222-5500.

Manufacturer campaign: 5309B

Read campaign 09V066000 at NHTSA
Check this car’s VIN at NHTSA

03 / The manufacturer’s record

Instructions. Updates. Responses.

262 distinct communications list this model-year. Showing the latest 12. A matching model-year does not establish that every engine, trim or reported symptom is covered.

Aug 20, 2026 Service Bulletin/Repair InstructionsSA-055-26Product Quality Information (PQI) DESCRIPTION Service Information MT-041/12 is no longer valid. It has been unpublished and superseded by the Field Quality Information Report (FQIR) reporting system.NHTSA ID 11037013

Product Quality Information (PQI) DESCRIPTION Service Information MT-041/12 is no longer valid. It has been unpublished and superseded by the Field Quality Information Report (FQIR) reporting system.

Components: UNKNOWN OR OTHER. Confirm detailed applicability in the original document.

Source record 11037013 at NHTSA
Jun 19, 2026 Service Bulletin/Repair InstructionsSA-041-26This SA supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-061/25 12/17/25 DESCRIPTION If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...), i…NHTSA ID 11034447

This SA supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-061/25 12/17/25 DESCRIPTION If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...), interview the customer before proceeding with normal MGSS diagnosis by asking if any aftermarket devices have been installed. Aftermarket devices may be the cause of the electrical concern. Below are a few examples of unusual electrical concerns caused by aftermarket devices. Examples: 1. Devices connected to the DLC-2 (battery discharge/DTC stored) 2. Devices plugged into the 12V outlet 3. GPS tracking device (engine no start/battery discharge) 4. Dash cam (DTC stored) 5. Non-certified USB cable (Apple Carplay™/ Android Auto™ will not connect) 6. Over-sized wheels/tires (incorrect GPS location) 7. DTC C0023:14 8. Decorative trim and/or cover on the START/STOP ENGINE button Example 1: Some electrical devices connected to the DLC-2 connector by insurance or mobile phone companies may cause: Battery discharge. The device may disrupt the CAN system battery saver mode. • IDS/MMDS will not communicate with the vehicle due to poor DLC-2 connection. The aftermarket device may cause DLC-2 female terminals to spread open.

Components: ELECTRICAL SYSTEM · ENGINE. Confirm detailed applicability in the original document.

Source record 11034447 at NHTSA
Apr 21, 2026 Service Bulletin/Repair InstructionsSA-029-26This 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 s…NHTSA ID 11032103

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 major vehicle systems. Mazda recommends dealers follow the scheduled maintenance tables as cited in the vehicle-specific workshop manual or owner's manual. Services performed outside of Mazda's factory scheduled maintenance are not recommended. These services are unnecessary and create unneeded expenses for your customers. SCHEDULED MAINTENANCE Refer to the applicable Workshop Manual or Owner's Manual for vehicle -specific manufacturer scheduled maintenance. Workshop Manual - Refer to section 00-00 SCHEDULED MAINTENANCE. Owner's Manual - Refer to section 8 Maintenance and Care. b. Note: Please refer to the information below outlining the services not included in Mazda's Factory Scheduled Maintenance: IMPORTANT: Recommending fluid flushes when not necessary can lead to customer confusion and dissatisfaction. Fluid flushing for preventive maintenance purposes is strongly discouraged, unless otherwise specified in a published procedure (Owner’s Manual, Workshop Manual, Technical Service Bulletin, etc.).

Components: ENGINE · POWER TRAIN · SERVICE BRAKES · UNKNOWN OR OTHER. Confirm detailed applicability in the original document.

Source record 11032103 at NHTSA
Dec 17, 2025 Service Bulletin/Repair InstructionsSA-061-25If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...), interview the customer before proceeding with normal MGSS diagnosis by asking if any aftermarket devices have been installe…NHTSA ID 11026917

If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...), interview the customer before proceeding with normal MGSS diagnosis by asking if any aftermarket devices have been installed. Aftermarket devices may be the cause of the electrical concern. Below are a few examples of unusual electrical concerns caused by aftermarket devices.

Components: ELECTRICAL SYSTEM. Confirm detailed applicability in the original document.

Source record 11026917 at NHTSA
Dec 10, 2025 Service Bulletin/Repair Instructions07-004-25aA musty/mildew type odor may come from the vents when the air conditioning (A/C) system is operating. It is most noticeable when the A/C is first turned ON. This odor is the result of mold growth in the A/C evaporator/cooling u…NHTSA ID 11026904

A musty/mildew type odor may come from the vents when the air conditioning (A/C) system is operating. It is most noticeable when the A/C is first turned ON. This odor is the result of mold growth in the A/C evaporator/cooling unit which is caused by condensation, dust, and pollen within the cooling unit. This condition is usually worse during high humidity conditions. “Mazda Air Cooling Coil Coating” is available to encapsulate the mold to reduce odors. If the product is properly applied, it can effectively reduce the musty/mildew odor for up to three years. NOTE: See parts information for Mazda Air Cooling Coil Coating and Kit part numbers.

Components: UNKNOWN OR OTHER. Confirm detailed applicability in the original document.

Source record 11026904 at NHTSA
Aug 22, 2025 Service Bulletin/Repair InstructionsSA-039/25Some vehicles may experience exterior trim heat damage such (melted, separating, etc.) when parked near a glass building or Low-E windows. This may be caused by the sun's reflection. If a structure's windows create enough of a …NHTSA ID 11022742

Some vehicles may experience exterior trim heat damage such (melted, separating, etc.) when parked near a glass building or Low-E windows. This may be caused by the sun's reflection. If a structure's windows create enough of a curve, the concave glass can focus the sun's rays onto a small area and acting like magnifiying glass direct the sunbeams into a hot pinpoint of light. This magnifcation of the sun's rays can cause damage to vehicle trim (see examples). Additional information and exemplar images regarding this phenomenon can be found by performing a google search.

Components: STRUCTURE:BODY · UNKNOWN OR OTHER. Confirm detailed applicability in the original document.

Source record 11022742 at NHTSA
Aug 14, 2025 Service Bulletin/Repair InstructionsSA-036-25When replacing the SiriusXM satellite radio unit, a call must be made to inform SiriusXM of the existing Radio ID and the new/replacement SAT Radio ID as soon as possible to ensure the customer leaves the dealership with an act…NHTSA ID 11022727

When replacing the SiriusXM satellite radio unit, a call must be made to inform SiriusXM of the existing Radio ID and the new/replacement SAT Radio ID as soon as possible to ensure the customer leaves the dealership with an active SAT radio.

Components: UNKNOWN OR OTHER. Confirm detailed applicability in the original document.

Source record 11022727 at NHTSA
Jun 19, 2025 Service Bulletin/Repair InstructionsSA-032-25Some customers may complain about a noisy HVAC blower motor or odor after a cabin air filter replacement. Foreign debris on the blower motor after servicing the cabin air filter may be the cause. During the removal of the cabin…NHTSA ID 11020039

Some customers may complain about a noisy HVAC blower motor or odor after a cabin air filter replacement. Foreign debris on the blower motor after servicing the cabin air filter may be the cause. During the removal of the cabin air filter, foreign debris (leaves, dust, dirt....ect.) may fall on the blower motor causing a fluttering type noise or odor.

Components: UNKNOWN OR OTHER. Confirm detailed applicability in the original document.

Source record 11020039 at NHTSA
May 22, 2025 Service Bulletin/Repair Instructions09-024-25Some vehicles may exhibit following symptoms: 1. The rearview mirror (1) rattles up and down (2) while adjusting the mirror. 2. The rearview mirror (1) makes a rattle noise depending on the road surface conditions while driving…NHTSA ID 11019097

Some vehicles may exhibit following symptoms: 1. The rearview mirror (1) rattles up and down (2) while adjusting the mirror. 2. The rearview mirror (1) makes a rattle noise depending on the road surface conditions while driving. This concern is caused during rearview mirror installation. The adhesive is squeezed out between the windshield and the mirror base. The rearview mirror is assembled on top of the overextended adhesive. The adhesive is softened by heat, and loosening screws, results in a rattling concern.

Components: UNKNOWN OR OTHER. Confirm detailed applicability in the original document.

Source record 11019097 at NHTSA
Apr 25, 2025 Service Bulletin/Repair Instructions07-004-25A musty/mildew type odor may come from the vents when the air conditioning (A/C) system is operating. It is most noticeable when the A/C is first turned ON. This odor is the result of mold growth in the A/C evaporator/cooling u…NHTSA ID 11017699

A musty/mildew type odor may come from the vents when the air conditioning (A/C) system is operating. It is most noticeable when the A/C is first turned ON. This odor is the result of mold growth in the A/C evaporator/cooling unit which is caused by condensation, dust, and pollen within the cooling unit. This condition is usually worse during high humidity conditions. “Mazda Air Cooling Coil Coating” is available to encapsulate the mold to reduce odors. If the product is properly applied, it can effectively reduce the musty/mildew odor for up to three years.

Components: UNKNOWN OR OTHER. Confirm detailed applicability in the original document.

Source record 11017699 at NHTSA
Aug 15, 2024 Service Bulletin/Repair InstructionsSA-058-24Some vehicles may experience exterior trim heat damage such (melted, separating, etc.) when parked near a glass building or Low-E windows. This may be caused by the sun's reflection.NHTSA ID 11007022

Some vehicles may experience exterior trim heat damage such (melted, separating, etc.) when parked near a glass building or Low-E windows. This may be caused by the sun's reflection.

Components: STRUCTURE:BODY. Confirm detailed applicability in the original document.

Source record 11007022 at NHTSA
Aug 15, 2024 Service Bulletin/Repair InstructionsSA-057-24If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...), interview the customer before proceeding with normal MGSS diagnosis by asking if any aftermarket devices have been installe…NHTSA ID 11007019

If you encounter any type of electrical concern (e.g, dead battery, engine no start, DTC(s) stored...), interview the customer before proceeding with normal MGSS diagnosis by asking if any aftermarket devices have been installed. Aftermarket devices may be the cause of the electrical concern. Below are a few examples of unusual electrical concerns caused by aftermarket devices.

Components: ELECTRICAL SYSTEM · ENGINE · UNKNOWN OR OTHER. Confirm detailed applicability in the original document.

Source record 11007019 at NHTSA
Browse all manufacturer records by page

Records below contain the NHTSA bulk summary unless a document-reviewed explainer is linked. A service bulletin is not a safety recall or a promise of a free repair. Records may be revised or superseded; verify the current document with the manufacturer.

04 / Agency investigations

Official inquiries.

An investigation is an inquiry into a potential concern. Its presence does not establish a defect, and a closed case does not certify a car’s condition.

Opened Jun 9, 2015 ClosedLower ball joint separationPE15022

In an July 7,2015 letter to NHTSA, Mazda identified a safety defect that could result in lower ball joint separation in approximately 193,484 model year (MY) 2007 through 2014 Mazda CX-9 vehicles (NHTSA Recall No. 15V-451,Mazda 8515G).Mazda indicated that damage to the ball joint boot may allow water to enter the front suspension ball joint fitting during use which may result in premature ball joint wear and a progressively looser joint.In January 2014, Mazda implemented redesigned lower control arms in production vehicles to improve the durability of the lower ball joints.The redesign involved changing the shape of the top surface of the ball joint boot cover and adding a suspension plate to the undersurface of the knuckle.Mazda's recall will replace the defect lower control arms with the redesigned parts.ODI's analysis of information collected during PE15-022 identified a total of 62 ball joint separation incidents, including 34 identified in ODI complaints and 31 identified in Mazda complaints and field reports (3 of the Mazda records involve vehicles/incidents that were also reported to ODI).When Mazda's design change was implemented, most of the field experience related to lower ball joints involved complaints of noise and premature wear-out.Only 1 of the ODI and 6 of the additional Mazda separation complaints identified in ODI's analysis were reported prior to January 2014.Significant increases in the number and trend in separation complaints were observed in 2015, when 30 of the ODI complaints and 16 of the additional Mazda complaints were reported.The report trend appears to be accelerating, with 29 of the reports received after ODI opened PE15-022 on June 9, 2015.There has been one crash reported to ODI related to the alleged defect (VOQ 10746510). This investigation is closed based on Mazda's recall.The 34 VOQs associated with this investigation are: 10747358, 10746510, 10744897, 10743509, 10736229, 10735938, 10734763, 10734302, 10734290, 10733813, 10732578, 10732217, 10732154, 10731850, 10730736, 10730280, 10730143, 10730114, 10726622, 10726480 10726448, 10726168, 10725839, 10725567, 10725488, 10725427, 10725390, 10717510, 10714469, 10695142, 10668978, 10648429, 10640541, 10546535

Recorded closure: Aug 20, 2015

Campaign reference in the source: 15V451000

Find investigation PE15022
Opened Aug 9, 2011 ClosedBrake master cylinder leakPE11026

The Office of Defects Investigation (ODI) opened PE11-026 to investigate possible brake performance loss due to brake fluid leaking from the master cylinder into the brake booster in model year (MY) 2008 Mazda CX-9 vehicles.In response to ODI's information request letter, Mazda identified a problem with the manufacturing process for the master cylinder primary plunger that could result in inappropriate surface finish.ODI's analysis of complaints and field reports determined that the problem was isolated to several months late in the production of the MY 2008 CX-9 vehicles.Mazda indicated that changes to the plunger machining and inspection processes were incorporated late in MY 2008 vehicle production (June 25, 2008).There are no confirmed failures related to the condition in subsequent production.The subject master cylinder was used by Mazda in MY 2007 through MY 2011 CX-9 vehicles (approximately 132,000 vehicles) with no other significant problems related to master cylinder leakage.ODI's analysis identified a total of 248 complaints and field reports potentially related to the subject condition in MY 2008 CX-9 vehicles.The majority of the records reported that brake malfunction indicator lamp (MIL) illumination was the only symptom of a problem, with only 4% (9 reports) alleging any symptoms related to brake pedal feel or effectiveness.ODI identified no crash claims related to the alleged defect.In addition, analysis of this data showed a declining trend with 90 percent of the incidents reported before January 2011.Based on the extremely slow leak rate associated with the alleged defect, the declining failure trend and the low probability that the condition would affect brake performance, this investigation is closed.The ODI reports cited above can be viewed at www-odi.nhtsa.dot.gov/owners/SearchNHTSAID under the following identification numbers (ODI Nos.): 10442322, 10419837, 10449109

Recorded closure: Apr 9, 2012

Find investigation PE11026

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