Paul Willis, the brand's British boss, has appeared before several British parliamentary committees since September 2015 when the firm admitted to using software to cheat diesel emission tests in the United States.
During his most recent appearance before the transport committee last month, Willis was pressed on the nature of the remedy and whether Britain had been fully repaid by VW for the cost of retesting models.
In a letter published on Wednesday, chairwoman Louise Ellman asked Willis to respond to eight points including on whether the firm will look into every complaint that the fix had affected vehicle performance, an issue at the heart of attempts by some law firms to take legal action against the company.
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