What are the most common Mazda CX-9 problems?
According to Au7o's analysis of 5,650+ owner reports, the 2007-2025 Mazda CX-9 has 8 documented issues. The most frequently reported are: Timing Chain Stretch on 3.7L V6, Water Pump and Coolant Crossover Pipe Leak (3.7L V6), Transfer Case Fluid Leak (AWD Models). Of these, 2 are rated critical and should be addressed promptly.
Is the Mazda CX-9 reliable?
The 2007-2025 Mazda CX-9 has 8 known issues documented across 5,650+ owner reports. 2 issues are rated critical: Timing Chain Stretch on 3.7L V6 and Water Pump and Coolant Crossover Pipe Leak (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 $150 to $3,500, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Timing Chain Stretch on 3.7L 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 2007-2025 Mazda CX-9 with 8 documented issues documented across 5,650+ owner reports.
What is the 2007-2015 Mazda CX-9 Timing Chain Stretch on 3.7L V6?
The Ford-derived 3.7L Duratec V6 in first-generation CX-9 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, can lead to jumped timing and sever… Repairs typically run $1,500-$3,500. Severity: high.
What is the 2007-2015 Mazda CX-9 Water Pump and Coolant Crossover Pipe Leak (3.7L V6)?
The Ford-derived 3.7L Cyclone V6 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 externally. Because the pum… Repairs typically run $1,500-$3,500. Severity: high.
What is the 2007-2023 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 2016-2023 Mazda CX-9 Turbocharger Coolant Line Leak?
The 2.5L turbo engine in second-generation CX-9 develops coolant leaks from the turbocharger coolant supply and return lines. Heat cycling causes the connection points and hoses to deteriorate. Low coolant levels can lead to turbo damage and engine overheating if not caught early… Repairs typically run $200-$600. Severity: medium.
What is the 2007-2015 Mazda CX-9 A/C Evaporator Core Leak and Refrigerant Loss?
First-generation CX-9 models are prone to A/C evaporator core leaks, causing gradual refrigerant loss and reduced cooling performance. The evaporator develops pinhole leaks from internal corrosion, often accelerated by moisture and debris in the system. Symptoms worsen in hot wea… Repairs typically run $800-$1,800. Severity: medium.
What is the 2016-2025 Mazda CX-9 Timing Chain Stretch and Rattle (2.5L Turbo SkyActiv)?
The second-generation CX-9 with the 2.5L turbocharged SkyActiv-G engine can develop timing chain stretch, producing a rattle or whine at startup that may persist for several seconds. Unlike the first-gen 3.7L V6 issue, the 2.5T chain stretch is typically less severe but still req… Repairs typically run $800-$2,000. Severity: medium.
What is the 2007-2015 Mazda CX-9 Rear Differential Coupling Failure (AWD)?
AWD CX-9 models use an electronically controlled rear differential coupling to distribute torque. The coupling can overheat and fail during aggressive driving or towing, and the internal clutch pack wears over time. A failing coupling may cause AWD warning lights, vibrations duri… Repairs typically run $200-$2,000. 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.
