For enhanced safety, the front and rear seat shoulder belts of the Audi S5 have pretensioners to tighten the seatbelts and eliminate dangerous slack in the event of a collision and force limiters to limit the pressure the belts will exert on the passengers. The BMW 4 Series Coupe doesn’t offer pretensioners for its rear seat belts.
To provide maximum traction and stability on all roads, All-Wheel Drive is standard on the S5. But it costs extra on the 4 Series Coupe.
When descending a steep, off-road slope, the S5’s standard Hill Descent Control allows you to creep down safely. The 4 Series Coupe doesn’t offer Hill Descent Control.
Both the S5 and 4 Series Coupe have rear cross-traffic warning, but the S5 Premium Plus/Prestige has Automatic Brake Activation (automatically applies the brakes) to better prevent a collision when backing near traffic. The 4 Series Coupe’s Cross Traffic Warning doesn’t automatically brake.
Both the S5 and the 4 Series Coupe have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, plastic fuel tanks, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, post-collision automatic braking systems, daytime running lights, lane departure warning systems, rearview cameras, available blind spot warning systems and around view monitors.
For its top level performance in IIHS driver and passenger-side small overlap frontal, moderate overlap frontal, side impact, roof strength and head restraint tests, its standard vehicle-to-vehicle front crash prevention system, its standard vehicle-to-pedestrian front crash prevention system, and its standard headlight’s “Good” rating, the Insurance Institute for Highway Safety grants the S5 its highest rating: “Top Safety Pick Plus” for 2022, a rating granted to only 128 vehicles tested by the IIHS. The 4 Series Coupe has not been tested, yet.