Most 2021 A3 saloons are fitted with the 1.5 TFSI petrol and Audi’s 7‑speed S tronic automatic; it’s smooth and brisk but uses more expensive servicing than mainstream brands. The S tronic needs periodic oil/mechatronic attention (service intervals and any software updates are worth confirming) and genuine Audi parts/repairs cost more than non-premium rivals. The saloon body gives a tidy boot but you won’t get the load space of an estate.

• S tronic gearbox behaviour and service record — shifts should be smooth with no jerks, and DSG/gearbox oil change history is important (many examples need oil/mechatronic service at set intervals).
• Oil consumption and turbo condition — check for excessive oil use, oily residue around the turbo/intercooler pipes and clear exhaust smoke after cold start.
• Suspension and steering for knocks over potholes — check front strut mounts, anti‑roll bar links and rear suspension for clunks typical of 5‑year‑old examples.
• Infotainment, parking sensors and reversing camera — test menus, smartphone mirroring (Apple CarPlay/Android Auto) and camera view for greys/lines or dropped signals.
• Rear seat space and ISOFIX mounts — confirm the rear headroom/legroom suits child seats and that ISOFIX anchors and top tethers are present and accessible.