2020 Audi S3 Problems: 6 Issues Every Owner Should Know
2020 model year · 423+ owner reports · Updated April 2026
According to Au7o's analysis of 423+ owner reports, the 2020 Audi S3 has 6 documented known issues, with 4 rated critical. The most serious are High-Pressure Fuel Pump (HPFP) Failure ($800-$1,800 repair), DQ250 DSG Mechatronic Unit Failure ($1,500-$4,000 repair), DQ381 S-Tronic Mechatronic Unit Failure ($500-$5,000 repair) and Water Pump and Thermostat Housing Failure (EA888 Gen 3) ($400-$1,500 repair). The most commonly reported issue is EA888 Carbon Buildup on Intake Valves with 178 owner reports. Across all issues, repair costs range from $200 to $5,000. DIY maintenance guides at au7o.io.