In Mazza v. American Honda Motor Co., 666 F.3d 581 (9th Cir. 2012), the California Court of Appeal stated that for a California breach of warranty claim to proceed, the movant for class certification must provide substantial evidence of a defect that is substantially certain to result in malfunction during the useful life of the product. 199 Cal. App. 4th at 1375. To do that, the movant must demonstrate through expert testimony that there was an inherent defect and that it caused the product to malfunction or that it was substantially certain the product would malfunction as a result of the defect. Id. at 1377.