NSU Prinz IV Workshop Manuals
If you have to perform maintenance tasks on your NSU Prinz IV then it is usually a good plan to own a Workshop Manual for reference in case you want to know proven methods to take off a certain component for example Exhaust and install it again perfectly.
NSU Prinz IV Workshop Manuals will provide you with identifiable diagnostic info for the car so if something is faulty it helps you find out what the issue is and how to fix it. You can then decide if this can be achieved on your own or in case the job is just too big you can actually book your Prinz IV in with a trusted repair garage.