Since these files are hosted on a US Government web site, we (Ross-Tech) feel comfortable sharing this content. These are the only Audi Self Study Programs that I was able to find, but I know Audi has been publishing these since at least 1990s. If you find additional Self Study Programs hosted on a official government web site, then please send me a private message with the URL so can update this list.
Vehicle Specific Stuff:
SSP 990143 - The 2015 Audi A3 Introduction
https://static.nhtsa.gov/odi/tsbs/2014/MC-10122167-9999.pdf
SSP 960243 - 2The 2015 A3 Cabriolet
https://static.nhtsa.gov/odi/tsbs/2014/MC-10122448-9999.pdf
SSP 960143 - The 2015 Audi A3 Running Gear and Suspension System
https://static.nhtsa.gov/odi/tsbs/2014/MC-10122163-9999.pdf
SSP 970343 - The 2015 Audi A3 Vehicle Electronics and Driver Assistance Systems
https://static.nhtsa.gov/odi/tsbs/2014/MC-10122166-9999.pdf
SSP 970243 - The 2015 Audi A3 Onboard Power Supply and Networking Systems
https://static.nhtsa.gov/odi/tsbs/2014/MC-10122165-9999.pdf
SSP 990243 - The 2015 Audi Q3 Introduction
https://static.nhtsa.gov/odi/tsbs/2014/MC-10122449-9999.pdf
SSP 990253 - The 2016 Audi TT Roadster
https://static.nhtsa.gov/odi/tsbs/2015/MC-10120848-9999.pdf
SSP 600275 - The 2016 Audi TT Roadster Sales and After Sales
https://static.nhtsa.gov/odi/tsbs/2015/MC-10120937-9999.pdf
SSP 600276 - The 2016 Audi TT Introduction Sales and After Sales
https://static.nhtsa.gov/odi/tsbs/2016/MC-10120935-9999.pdf
SSP 970153 - The 2016 Audi TT Vehicle Electrics, Electronics, and Infotainment Systems
https://static.nhtsa.gov/odi/tsbs/2015/MC-10120847-9999.pdf
SSP 990263 - The 2017 A4 Introduction
https://static.nhtsa.gov/odi/tsbs/2015/MC-10118336-9999.pdf
SSP 970563 - The 2017 A4 Electronic and Electrical Systems
https://static.nhtsa.gov/odi/tsbs/2015/MC-10118334-9999.pdf
SSP 990363 - The 2017 Audi R8 Introduction
https://static.nhtsa.gov/odi/tsbs/2016/MC-10119355-9999.pdf
SSP 970173 - The 2017 Audi R8 Electrics, Electronics, and Infotainment Systems
https://static.nhtsa.gov/odi/tsbs/2016/MC-10118386-9999.pdf
SSP 9501473 - The OBZ 7-speed Dual Clutch S tronic Transmission in the 2017 R8
https://static.nhtsa.gov/odi/tsbs/2016/MC-10130218-9999.pdf
SSP 990693 - The 2019 Audi A6 Introduction
https://static.nhtsa.gov/odi/tsbs/2018/MC-10149155-9999.pdf
SSP 990593 - The 2019 Audi A7 Introduction
https://static.nhtsa.gov/odi/tsbs/2018/MC-10144688-9999.pdf
SSP 990493 - The 2019 Audi A8 Introduction
https://static.nhtsa.gov/odi/tsbs/2018/MC-10144687-9999.pdf
SSP 990293 - The 2019 Audi A8 Infotainment and Audi Connect Systems
https://static.nhtsa.gov/odi/tsbs/2018/MC-10144685-9999.pdf
SSP 980193 - The 2019 Audi A8 Climate Control Systems
https://static.nhtsa.gov/odi/tsbs/2018/MC-10144684-9999.pdf
SSP 990393 - The 2019 Audi A8 Driver Assistance Systems
https://static.nhtsa.gov/odi/tsbs/2018/MC-10144686-9999.pdf
SSP 970293 - The 2019 Audi A8 Electrics and Electronics
https://static.nhtsa.gov/odi/tsbs/2018/MC-10144683-9999.pdf
SSP 960293 - The 2019 Audi A8 Running Gear and Suspension Systems
https://static.nhtsa.gov/odi/tsbs/2018/MC-10144682-9999.pdf
SSP 990893 - The 2019 Audi Q3 Introduction
https://static.nhtsa.gov/odi/tsbs/2019/MC-10160830-0001.pdf
SSP 990793 - The 2019 Audi Q8 Introduction
https://static.nhtsa.gov/odi/tsbs/2018/MC-10149156-9999.pdf
SSP 990993 - The 2019 Audi e-tron Introduction
https://static.nhtsa.gov/odi/tsbs/2019/MC-10155750-9999.pdf
Engines:
SSP 920273 - The Audi 2.5l TFSI Engine EA855 EVO Series
[/URL]
SSP 920163 - Audi Third Generation 2.0l Engines
https://static.nhtsa.gov/odi/tsbs/2016/SB-10105867-2280.pdf
SSP 920253 - The Audi 1.4l TFSI Engine
https://static.nhtsa.gov/odi/tsbs/2015/MC-10124696-9999.pdf
SSP 920213 - The Second Generation 3.0L V6 TDI Engine
https://static.nhtsa.gov/odi/tsbs/2012/MC-10072887-0699.pdf
SSP 920493 - The Audi 4.0l V8 TFSI engine from the EA825 series
https://static.nhtsa.gov/odi/tsbs/2020/MC-10172005-0001.pdf
SSP 920243 - The Audi 1.8L and 2.0L Third Generation EA888 Engines
https://static.nhtsa.gov/odi/tsbs/2014/MC-10122162-9999.pdf
Various Technologies:
SSP 910153 - Audi Virtual Cockpit
https://static.nhtsa.gov/odi/tsbs/2016/MC-10120936-9999.pdf
SSP 970133 - Audi Occupant Protection Systems
https://static.nhtsa.gov/odi/tsbs/2013/MC-10068885-6903.pdf
SSP 960393 - Active suspension
https://static.nhtsa.gov/odi/tsbs/2020/MC-10172997-0001.pdf
Vehicle Specific Stuff:
SSP 990143 - The 2015 Audi A3 Introduction
https://static.nhtsa.gov/odi/tsbs/2014/MC-10122167-9999.pdf
SSP 960243 - 2The 2015 A3 Cabriolet
https://static.nhtsa.gov/odi/tsbs/2014/MC-10122448-9999.pdf
SSP 960143 - The 2015 Audi A3 Running Gear and Suspension System
https://static.nhtsa.gov/odi/tsbs/2014/MC-10122163-9999.pdf
SSP 970343 - The 2015 Audi A3 Vehicle Electronics and Driver Assistance Systems
https://static.nhtsa.gov/odi/tsbs/2014/MC-10122166-9999.pdf
SSP 970243 - The 2015 Audi A3 Onboard Power Supply and Networking Systems
https://static.nhtsa.gov/odi/tsbs/2014/MC-10122165-9999.pdf
SSP 990243 - The 2015 Audi Q3 Introduction
https://static.nhtsa.gov/odi/tsbs/2014/MC-10122449-9999.pdf
SSP 990253 - The 2016 Audi TT Roadster
https://static.nhtsa.gov/odi/tsbs/2015/MC-10120848-9999.pdf
SSP 600275 - The 2016 Audi TT Roadster Sales and After Sales
https://static.nhtsa.gov/odi/tsbs/2015/MC-10120937-9999.pdf
SSP 600276 - The 2016 Audi TT Introduction Sales and After Sales
https://static.nhtsa.gov/odi/tsbs/2016/MC-10120935-9999.pdf
SSP 970153 - The 2016 Audi TT Vehicle Electrics, Electronics, and Infotainment Systems
https://static.nhtsa.gov/odi/tsbs/2015/MC-10120847-9999.pdf
SSP 990263 - The 2017 A4 Introduction
https://static.nhtsa.gov/odi/tsbs/2015/MC-10118336-9999.pdf
SSP 970563 - The 2017 A4 Electronic and Electrical Systems
https://static.nhtsa.gov/odi/tsbs/2015/MC-10118334-9999.pdf
SSP 990363 - The 2017 Audi R8 Introduction
https://static.nhtsa.gov/odi/tsbs/2016/MC-10119355-9999.pdf
SSP 970173 - The 2017 Audi R8 Electrics, Electronics, and Infotainment Systems
https://static.nhtsa.gov/odi/tsbs/2016/MC-10118386-9999.pdf
SSP 9501473 - The OBZ 7-speed Dual Clutch S tronic Transmission in the 2017 R8
https://static.nhtsa.gov/odi/tsbs/2016/MC-10130218-9999.pdf
SSP 990693 - The 2019 Audi A6 Introduction
https://static.nhtsa.gov/odi/tsbs/2018/MC-10149155-9999.pdf
SSP 990593 - The 2019 Audi A7 Introduction
https://static.nhtsa.gov/odi/tsbs/2018/MC-10144688-9999.pdf
SSP 990493 - The 2019 Audi A8 Introduction
https://static.nhtsa.gov/odi/tsbs/2018/MC-10144687-9999.pdf
SSP 990293 - The 2019 Audi A8 Infotainment and Audi Connect Systems
https://static.nhtsa.gov/odi/tsbs/2018/MC-10144685-9999.pdf
SSP 980193 - The 2019 Audi A8 Climate Control Systems
https://static.nhtsa.gov/odi/tsbs/2018/MC-10144684-9999.pdf
SSP 990393 - The 2019 Audi A8 Driver Assistance Systems
https://static.nhtsa.gov/odi/tsbs/2018/MC-10144686-9999.pdf
SSP 970293 - The 2019 Audi A8 Electrics and Electronics
https://static.nhtsa.gov/odi/tsbs/2018/MC-10144683-9999.pdf
SSP 960293 - The 2019 Audi A8 Running Gear and Suspension Systems
https://static.nhtsa.gov/odi/tsbs/2018/MC-10144682-9999.pdf
SSP 990893 - The 2019 Audi Q3 Introduction
https://static.nhtsa.gov/odi/tsbs/2019/MC-10160830-0001.pdf
SSP 990793 - The 2019 Audi Q8 Introduction
https://static.nhtsa.gov/odi/tsbs/2018/MC-10149156-9999.pdf
SSP 990993 - The 2019 Audi e-tron Introduction
https://static.nhtsa.gov/odi/tsbs/2019/MC-10155750-9999.pdf
Engines:
SSP 920273 - The Audi 2.5l TFSI Engine EA855 EVO Series
[/URL]
SSP 920163 - Audi Third Generation 2.0l Engines
https://static.nhtsa.gov/odi/tsbs/2016/SB-10105867-2280.pdf
SSP 920253 - The Audi 1.4l TFSI Engine
https://static.nhtsa.gov/odi/tsbs/2015/MC-10124696-9999.pdf
SSP 920213 - The Second Generation 3.0L V6 TDI Engine
https://static.nhtsa.gov/odi/tsbs/2012/MC-10072887-0699.pdf
SSP 920493 - The Audi 4.0l V8 TFSI engine from the EA825 series
https://static.nhtsa.gov/odi/tsbs/2020/MC-10172005-0001.pdf
SSP 920243 - The Audi 1.8L and 2.0L Third Generation EA888 Engines
https://static.nhtsa.gov/odi/tsbs/2014/MC-10122162-9999.pdf
Various Technologies:
SSP 910153 - Audi Virtual Cockpit
https://static.nhtsa.gov/odi/tsbs/2016/MC-10120936-9999.pdf
SSP 970133 - Audi Occupant Protection Systems
https://static.nhtsa.gov/odi/tsbs/2013/MC-10068885-6903.pdf
SSP 960393 - Active suspension
https://static.nhtsa.gov/odi/tsbs/2020/MC-10172997-0001.pdf