The best course of action VW could take is to start form scratch and attempt to rebuild the trust of its customers. To do this they have to force some of the higher ups in the company to resign and step down in order to let a new person of power or CEO to step in. The New Leader has not betrayed its customers and will hopefully be able to rebuild the credibility of VW so that they can become productive in the future. In this Case, the CEO is using trust to guide the next set of codes for his or her behavior. Ethical Trust is gong to become a major factor in VW and will be important towards how they operate in the future. They are going to be monitored very closely in the future so they will need a strong leader who has the right code of ethics behind the to take the company in the right directions.
The next step they would take is recalling all of their vehicles (which they have) to ensure that all the defeat devices are off the road and terminated. This is just another step to starting fresh. Issues are going to arise where they may need to provide compensation for those who were not satisfied and are offended by what VW tried to pull off. So they will have to deal with those as the company begins to take back their vehicles. The next step they are going to have to do is to redesign their engines. The whole reason they were in this mess was because it was going to cost too much to change their engines in order to reach the proper emissions level. They are going to need to establish a team to redo and revamp their automobiles that are going to consist of top level engineers. This is going to cost a lot of money but it is something they have to do. VW has set aside $1.2 Billion of its capital in order to fix this issue. It all could have been avoided if they spent the money in the future and making their cars the right way.
I think this is the only way they can continue to be successful in the future. They must base their ethical framework on trust and begin new stages of development. This course of action will ensure a fresh start and show its customers they are taking all the necessary courses of action to create the right ethical standards for the company in the future.