Volkswagen (VOWG_p.DE) has dampened hopes for quick results from an investigation into its rigging of diesel emissions tests and said developing a fix for the affected cars rather than finding the root cause of the manipulations is its top priority. “I understand the desire for speed, but what matters to us instead is to work thoroughly and to not give out false premature results,” VW brand sales chief Juergen Stackmann said at a panel discussion late on Tuesday.