For enhanced safety, the front and second-row seat shoulder belts of the Hyundai Ioniq 9 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 Ford Mustang Mach-E doesn’t offer pretensioners for its rear seat belts.
The Ioniq 9 has a standard front seat center airbag, which deploys between the driver and front passenger, protecting them from injuries caused by striking each other in serious side impacts. The Mustang Mach-E doesn’t offer front seat center airbags.
When descending a steep, off-road slope, the Ioniq 9’s standard Downhill Brake Control allows you to creep down safely. The Mustang Mach-E doesn’t offer Downhill Brake Control.
The Hyundai Ioniq 9 comes with a standard Surround View Monitor, while the Ford Mustang Mach-E doesn’t offer a camera washer, requiring manual cleaning.
Both the Ioniq 9 and the Mustang Mach-E have standard driver and passenger frontal airbags, front and rear side-impact airbags, driver knee airbags, side-impact head airbags, height adjustable front shoulder belts, four-wheel antilock brakes, traction control, electronic stability systems to prevent skidding, crash mitigating brakes, daytime running lights, lane departure warning systems, blind spot warning systems, rearview cameras, rear cross-path warning, driver alert monitors and available around view monitors.
The Hyundai Ioniq 9 weighs 532 to 1614 pounds more than the Ford Mustang Mach-E. The NHTSA advises that heavier vehicles are much safer in collisions than their significantly lighter counterparts.