2007-2023 Mazda CX-9 Problems: 11 Known Issues
2007-2023 model years · 4,750+ owner reports · Updated November 2026
According to Au7o's analysis of 4,750+ owner reports, the 2007-2023 Mazda CX-9 has 11 documented known issues, with 6 rated critical. The most serious are Timing Chain Stretch on 3.5L/3.7L V6 ($1,500-$3,500 repair), Front Lower Control Arm Ball Joint Corrosion and Separation ($0-$0 repair), Low-Pressure Fuel Pump Impeller Cracking and Stall (Denso Pump Recall) ($0-$0 repair), Cracked Cylinder Head Coolant Leak (2.5L Turbo SkyActiv PY-VPTS), Takata Passenger Airbag Inflator Rupture (Do Not Drive Advisory) ($0-$0 repair) and Water Pump and Coolant Crossover Pipe Leak (3.5L/3.7L V6) ($1,500-$3,500 repair). The most commonly reported issue is Timing Chain Stretch on 3.5L/3.7L V6 with 2,400 owner reports. Across all issues with published estimates, repair costs range from $150 to $3,500. DIY maintenance guides at au7o.io.
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All 11 Known Issues
NHTSA Recalls3 recalls
SEATS:MID/REAR ASSEMBLY
Mazda North American Operations (Mazda) is recalling certain 2020-2021 CX-9 vehicles equipped with 60/40 split bench second-row seats. The left-side second-row seat may unexpectedly slide forward during a crash. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 210, "Seat Belt Assembly Anchorages."
FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
Mazda North American Operations (Mazda) is recalling certain 2018 Mazda3, Mazda6, 2019 CX-3, 2018-2019 MX-5, CX-5, CX-9, and 2019-2020 Mazda2 vehicles. The impeller inside the low-pressure fuel pump may crack and deform, potentially causing the fuel pump to fail.
TIRES:TREAD/BELT
Mazda North American Operations (Mazda) is recalling certain 2019 CX-9 vehicles equipped with Sumitomo Falken ZIEX CT50 A/S tires, size P255/50R20 104V, having date code 1619. An incorrect rubber compound may have been used in the tire's manufacturing, allowing the tread to separate and detach.
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Frequently Asked Questions
What are the most common Mazda CX-9 problems?
According to Au7o's analysis of 4,750+ owner reports, the 2007-2023 Mazda CX-9 has 11 documented issues. The most frequently reported are: Timing Chain Stretch on 3.5L/3.7L V6, Front Lower Control Arm Ball Joint Corrosion and Separation, Low-Pressure Fuel Pump Impeller Cracking and Stall (Denso Pump Recall). Of these, 6 are rated critical and should be addressed promptly.
Is the Mazda CX-9 reliable?
The 2007-2023 Mazda CX-9 has 11 known issues documented across 4,750+ owner reports. 6 issues are rated critical: Timing Chain Stretch on 3.5L/3.7L V6 and Front Lower Control Arm Ball Joint Corrosion and Separation and Low-Pressure Fuel Pump Impeller Cracking and Stall (Denso Pump Recall) and Cracked Cylinder Head Coolant Leak (2.5L Turbo SkyActiv PY-VPTS) and Takata Passenger Airbag Inflator Rupture (Do Not Drive Advisory) and Water Pump and Coolant Crossover Pipe Leak (3.5L/3.7L V6). 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 CX-9 problems?
Repair costs for known Mazda CX-9 issues range from $0 to $3,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Timing Chain Stretch on 3.5L/3.7L V6, typically costs $1,500-$3,500 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What year Mazda CX-9 is the most reliable?
Reliability varies across model years of the Mazda CX-9. 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 2007-2023 Mazda CX-9 with 11 documented issues documented across 4,750+ owner reports.
What is the 2007-2015 Mazda CX-9 Timing Chain Stretch on 3.5L/3.7L V6?
The Ford-derived V6 in first-generation CX-9 (3.5L in 2007, 3.7L Duratec from 2008) suffers from timing chain stretch, typically between 80,000-120,000 miles. Chain guides and tensioners wear, causing timing to retard and triggering check engine codes. If not addressed, it can le… Repairs typically run $1,500-$3,500. Severity: high.
What is the 2007-2014 Mazda CX-9 Front Lower Control Arm Ball Joint Corrosion and Separation?
Certain 2007–2014 CX-9 vehicles built October 24, 2006–December 28, 2013 are covered by recall 15V451 / Mazda 8515G. Water and road salt can enter the front lower ball-joint fitting, causing corrosion, looseness and a possible rattle. Continued operation can lead to separation of… Repairs typically run $0-$0. Severity: high.
What is the 2018-2019 Mazda CX-9 Low-Pressure Fuel Pump Impeller Cracking and Stall (Denso Pump Recall)?
US recall 21V875 / Mazda 5321K includes certain 2018–2019 CX-9 vehicles built April 16–October 17, 2018 with affected Denso low-pressure fuel pumps. Mazda identifies 13,359 CX-9s across those two model years, not every CX-9. Impeller material can crack and deform until it interfe… Repairs typically run $0-$0. Severity: high.
What is the 2016-2020 Mazda CX-9 Cracked Cylinder Head Coolant Leak (2.5L Turbo SkyActiv PY-VPTS)?
Certain 2016–2020 CX-9 vehicles with the 2.5L turbo engine can leak coolant from cracks in the cylinder head near the exhaust-manifold mounting area. Mazda revised the head and exhaust-manifold gasket. Repair depends on diagnosis: a replacement cylinder head is a documented remed… Severity: high.
What is the 2007-2015 Mazda CX-9 Takata Passenger Airbag Inflator Rupture (Do Not Drive Advisory)?
Recalled Takata passenger-airbag inflators in certain 2007–2015 CX-9 vehicles can rupture during deployment, sending metal fragments into the cabin. Heat, humidity and temperature cycling can degrade the propellant. Mazda's August 2024 do-not-drive advisory covers unrepaired affe… Repairs typically run $0-$0. Severity: high.
What is the 2007-2015 Mazda CX-9 Water Pump and Coolant Crossover Pipe Leak (3.5L/3.7L V6)?
The Ford-derived Cyclone V6 (3.5L in 2007, 3.7L from 2008) in first-gen CX-9 models has a water pump mounted in the engine V that is driven by the timing chain. The pump seal and the coolant crossover pipe gaskets are common failure points, causing coolant to leak internally or e… Repairs typically run $1,500-$3,500. Severity: high.
What is the 2007-2015 Mazda CX-9 Transfer Case Fluid Leak (AWD Models)?
AWD-equipped CX-9 models develop fluid leaks from the power transfer unit (PTU) / transfer case. The output shaft seal and case halves are common leak points. Low fluid levels lead to increased wear, whining noises, and eventual transfer case failure. Fluid changes are not part o… Repairs typically run $150-$2,000. Severity: medium.
What is the 2016-2020 Mazda CX-9 Mazda Connect CMU Freezing, Reboot Loop and Blank Screen?
The Connectivity Master Unit that runs Mazda Connect / MZD Connect on the CX-9 fails in a recognizable pattern: the screen freezes and stops responding to both the touchscreen and the commander knob, the system reboots repeatedly on its own, or it comes up blank with a long delay… Severity: medium.
What is the 2021 Mazda CX-9 Exhaust valve-seal oil consumption — certain 2021 CX-9 2.5T?
Mazda documents increased oil consumption from damaged exhaust valve seals, with low-oil warning and possible P250F:00. The CX-9 scope is certain 2021 2.5T vehicles: US/Canada 10.25-inch-display VINs JM3TC******509027–541070 (October 6, 2020–September 13, 2021), or Canada/Mexico… Severity: medium.
What is the 2007-2015 Mazda CX-9 A/C Slowly Loses Refrigerant: Leak at the Evaporator, Lines, or Service Valve?
First-generation CX-9 owners report A/C that cools after a recharge, then goes warm again within weeks or months. On the owner forum, 2008 CX-9 owners traced these leaks to several places: a leaking aluminum A/C line under the coolant reservoir, a suspected leaking low-side servi… Repairs typically run $800-$1,800. Severity: medium.
What is the 2016-2023 Mazda CX-9 Power Liftgate Failure?
The power liftgate system fails to open, close, or hold position. Causes include liftgate strut motors wearing out, latch mechanism failure, and wiring harness damage in the rubber boot between body and liftgate. Cold weather exacerbates the issue as struts lose gas pressure. Repairs typically run $300-$900. Severity: low.
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.