If you don't have the code, you must find the serial number (e.g., VWZ1Z2F1234567 Screen Display
Before downloading any third-party software, check these official locations where the code is often stored for free: vw radio code generator free download work
If you cannot get it for free, paying a reputable online service is the closest thing to a "generator." These sites have purchased access to the VW master database or have scraped it legally. If you don't have the code, you must
For most VW radios (RCD 310, RCD 510, RNS 510, etc.): If you don't have the code