| Mesin bensin[16] |
| Model | Tipe/kode mesin | Tenaga@rpm | Torsi@rpm | 0–100 km/jam akselerasi | Kec. maks | Transmisi |
| A3 1.2 TFSI | 1.197 cc (73 cu in) I4 | 105 PS (77 kW; 104 hp) @ 5,000 | 175 N⋅m (129 lb⋅ft) @ 1,400–3,500 | 10.3 s | 193 km/h (120 mph) | 6-speed manual 7-speed S Tronic (optional) |
| A3 1.4 TFSI | 1.395 cc (85 cu in) I4 | 125 PS (92 kW; 123 hp) @ 5,000–6,000 | 200 N⋅m (148 lb⋅ft) @ 1,400–4,000 | 9.3 s | 203 km/h (126 mph) | 6-speed manual 7-speed S Tronic (optional) |
| A3 1.4 TFSI | 1.395 cc (85 cu in) I4 | 150 PS (110 kW; 148 hp) @ 5,000–6,000 | 250 N⋅m (184 lb⋅ft) @ 1,500–3,500 | 8.3 s | 212 km/h (132 mph) | 6-speed manual 7-speed S Tronic (optional) |
| A3 1.8 TFSI | 1.798 cc (110 cu in) I4 | 180 PS (132 kW; 178 hp) @ 5,100–6,200 | 250 N⋅m (184 lb⋅ft) @ 1,250–5,000 | 7.2 s | 232 km/h (144 mph) | 6-speed manual or 6-Speed S-Tronic automatic 7-speed S Tronic (optional) |
| A3 2.0 TFSI | 1.984 cc (121 cu in) I4 | 223 PS (164 kW; 220 hp) @ 4,500–6,200 | 350 N⋅m (258 lb⋅ft) @ 1,600–4,400 | 5.8 s | 232 km/h (144 mph) | 6-speed S-Tronic automatic S Tronic |
| S3 2.0 TFSI | 1.984 cc (121 cu in) I4 | 310 PS (228 kW; 306 hp) @ 5,500–6,200 | 380 N⋅m (280 lb⋅ft) @ 1,800–5,500 | 4.6 s (S-Tronic) | 249 km/h (155 mph) | 6-speed manual 7-speed (2017) S Tronic (optional) |
| RS 3 2.5 TFSI | 2.480 cc (151 cu in) I5 | 367 PS (270 kW; 362 hp) @ 5,550–6,800 | 465 N⋅m (343 lb⋅ft) @ 1,625–5,550 | 4.3 s | 280 km/h (174 mph) | 7-speed S Tronic |
| Mesin diesel[16] |
| Model | Tipe/kode mesin | Tenaga@rpm | Torsi@rpm | 0–100 km/jam akselerasi | Kec. maks | Transmisi |
| A3 1.6 TDI | 1.598 cc (98 cu in) I4 | 105 PS (77 kW; 104 hp) @ 3,000–4,000 | 250 N⋅m (184 lb⋅ft) @ 1,500–2,750 | 10.7 s | 195 km/h (121 mph) | 6-speed manual 7-speed S Tronic (optional) |
| A3 2.0 TDI | 1.968 cc (120 cu in) I4 | 150 PS (110 kW; 148 hp) @ 3,500–4,000 | 320 N⋅m (236 lb⋅ft) @ 1,750–3,000 | 8.6 s | 213 km/h (132 mph) | 6-speed manual 6-speed S Tronic (optional) |
| A3 2.0 TDI | 1.968 cc (120 cu in) I4 | 184 PS (135 kW; 181 hp) @ 3,500–4,000 | 380 N⋅m (280 lb⋅ft) @ 1,750–3,250 | 7.3 s | 230 km/h (143 mph) | 6-speed manual 6-speed S Tronic (optional) |