Toyota bought back at least two cars in 2009 after dealer technicians reported unintended acceleration that couldn't be diagnosed, according to new filings in a class-action lawsuit.

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The buy-backs included strict confidentiality agreements barring consumers from disclosing the problem to anyone and from suing the automaker, according to the amended class-action complaint.

Toyota says those two vehicles showed no unreported defects after thousands of testing miles. [AP]