ARTICLE · 09 NOVEMBER 2026
No Common Proof, No Class: C.D. Cal. Denies Certification In Engine Defect Case
This monthly newsletter examines critical developments in product liability and mass tort litigation, including FDA guidance on PFAS in medical devices, state-level AI regulation in legal practice, and significant procedural rulings from federal courts. The analysis covers regulatory updates, class action certification standards, and emerging trends that shape litigation strategy across multiple industries.
United StatesLitigation, Mediation & Arbitration
Key Takeaways
- A federal court in California denied class certification in a vehicle defect suit because evidence of the manufacturer’s knowledge varied based on when each class member bought their car.
- A consumer fraud class can fail at class certification if evidence of the defendant’s alleged knowledge post-dates certain purported class members’ purchases, as individualized issues of knowledge, duty, and reliance predominate. While limited to these facts, this decision may prompt courts weighing class certification to scrutinize the gap between when key knowledge arose and when plaintiffs purchased the products at issue.
On September 30, 2026, the U.S. District Court for the Central District of California denied class certification to Mercedes-Benz owners who alleged the automaker concealed a piston-cracking defect in its M274-LS engine. Jamil v. Mercedes-Benz USA, LLC, No. 2:22-cv-08130-FLA (AJRx), 2026 WL 2970638 (C.D. Cal. Sept. 30, 2026). Plaintiffs Lena Jamil and
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