In the past twenty years hundreds of infants and young children have died after being left in vehicles, usually by accident. When turning the vehicle off, drivers of the Mustang are reminded to check the back seat. The 4 Series Convertible doesn’t offer a back seat reminder.
Both the Mustang and 4 Series Convertible have rear cross-traffic warning, but the Mustang has Cross Traffic Braking (automatically applies the brakes) to better prevent a collision when backing near traffic. The 4 Series Convertible’s Cross Traffic Warning doesn’t automatically brake.
Both the Mustang and the 4 Series Convertible have standard driver and passenger frontal airbags, front side-impact airbags, driver and front passenger knee airbags, side-impact head airbags, front and rear seatbelt pretensioners, 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, blind spot warning systems, rearview cameras, rear cross-path warning and driver alert monitors.

