Mazda owners have been increasingly frustrated with a growing number of Mazda coolant leak issues that can lead to severe engine damage. 

Affected models—namely:

• 2019-2020 Mazda CX-5
• 2016-2020 Mazda CX-9
• 2018-2020 Mazda 6

—have been plagued by defects that cause coolant to leak, leading to engine overheating and, in some cases, catastrophic engine failure.

Understanding the Problem

The root of the issue lies in a latent manufacturing and/or design defect in the SKYACTIV-G 2.5T engine. The defect creates a structural weakness in the cylinder head near the exhaust manifold, which eventually leads to leaks.

Whether it's a Mazda 6 coolant leak, a Mazda CX-5 coolant leak, a Mazda CX-9 coolant leak, or even a Mazda 2.5t coolant leak, the consequences can be severe. The coolant mixes with the engine oil, reducing its viscosity and causing significant engine damage. In extreme cases, this problem has forced owners to opt for a complete engine replacement.

Real Owner Complaints

Real-life experiences underscore the severity of the situation. In one forum discussion, an owner lamented,

"I discovered a coolant leak in my Mazda CX-9 which led to the need for an engine replacement. I was frustrated over the unexpected nature of such a significant repair and the associated costs."

Another owner from a separate thread expressed:

"I have a persistent coolant leak in my CX-9, which led to engine overheating and eventual engine failure. I am extremely dissatisfied with Mazda's response."

Furthermore, the Mazda coolant leak class action lawsuit filed on April 10, 2024, highlights that Mazda was allegedly aware of these defects. One plaintiff stated,

"I trusted Mazda with my safety and finances, only to be let down by their lack of transparency."

These complaints are echoed by numerous owners who have faced similar issues, reflecting a widespread problem that continues to impact vehicle performance and owner satisfaction.

Technical Causes and Repair Solutions

Technical Service Bulletins (TSBs) have been issued—most notably by Mazda on October 15, 2021—to address this problem. The TSB outlines that cracks in the cylinder head, often due to residual stress or deformation from the exhaust system, are the primary culprits behind the Mazda coolant leak problem.

Repair procedures include:

• Inspecting the coolant system for diagnostic trouble codes;
• Checking engine oil for signs of coolant contamination;
• Replacing the cylinder head assembly with a modified exhaust manifold gasket to prevent future leaks.

For those who have experienced a Mazda CX-9 coolant leak or similar issues, these repairs can be both costly and inconvenient.

Legal Remedies for Affected Owners

Owners with substantial and recurring problems may be entitled to a refund or replacement under lemon law. Other owners may have claims for breach of warranty under the Magnuson-Moss Act.

If you are facing issues with a Mazda coolant leak—be it a Mazda 6 coolant leak, Mazda CX-5 coolant leak, Mazda CX-9 coolant leak, or Mazda 2.5t coolant leak—it is essential to know that you have legal options.

The ongoing Mazda coolant leak class action lawsuit is just one example of how affected owners are seeking justice and compensation for diminished vehicle value and unexpected repair costs.

How We Can Help

If you're in NY or NJ and have experienced these issues, we are here to assist. Our team of experienced lemon law attorneys offers a free consultation to help you determine if you have a claim. We handle cases on a contingency basis, ensuring that you do not pay any fees unless we win your case.

Contact us today for your free consultation and take the first step toward securing the compensation you deserve.

NOTE: Our office handles vehicle claims for 2020 or newer models unless there is a separate extended warranty!

Sources:

• ClassAction.org – Mazda Coolant Leak Lawsuit Article
• ClassAction.org – Jarvis et al. v. Mazda Motor of America, Inc. et al. (PDF)
• MazdaForum.com – Coolant Leak - Engine Replacement
• MazdaForum.com – CX-9 Coolant Issue
• NHTSA – Technical Service Bulletin (TSB)
• Riley Mazda – How to Fix a Mazda Coolant Leak

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• Mazda Engine and Coolant Problem
• 2019 Mazda CX-5 Owners' Nightmares: Engine Problems and Unexplained Acceleration - Consult Our Lemon Law Attorneys Now!