Drop down to the Audi A3 and prior body or panel repair turns up on 67% of cars against the 36% we would expect for sedans of the same age and mileage in the Kingdom, so the A4 is the safer used buy of the two despite costing more. Step up to the Audi A8 and electrical faults become the more common concern instead, at 29% against an expected 11% for the class — a different trade rather than a straightforward upgrade. Against the BMW 740, similarly priced, mechanical faults there run at 11% against 20% expected for sedans of the same class — a strong result worth weighing against the A4 on the used market.