The passenger compartment of the iX remained stable in the frontal offset test. Dummy numbers showed good protection of the knees and femurs of both the driver and passenger. BMW showed that a similar level of protection would be provided to occupants of different sizes and to those sitting in different positions.  Analysis of the deceleration of the impact trolley during the test, and analysis of the deformable barrier after the test, revealed that the iX would be an aggressive impact partner in a frontal collision. In the full-width rigid barrier test, good protection was provided to all critical body areas of the driver and rear passenger, except for the chest of the passenger, protection of which was adequate. In both the side barrier test and the more severe side pole impact, protection of all critical body areas was good and the car scored maximum points in this part of the assessment. The iX has a centre airbag to mitigate occupant to occupant injuries in the event of a lateral collision.  In Euro NCAP’s test, the airbag worked well, with good protection of the dummies’ heads.  Limitation of the extent to which a body is thrown to the other side of the car in a side impact was also good.  Tests on the front seats and head restraints demonstrated good protection against whiplash injuries in the event of a rear-end collision.  A geometric analysis of the rear seats also indicated good whiplash protection.  The iX is equipped with an advanced e-Call system which notifies the emergency services in the event of an accident.  A multi-collision braking system is also standard, to prevent secondary collisions.  However, the system did not meet Euro NCAP’s requirements and was not rewarded.

In the both the frontal offset test and the side barrier test, protection of all critical body regions was good, for both child dummies.  The front passenger airbag can be disabled to allow a rearward-facing child restraint to be used in that seating position.  Clear information is provided to the driver regarding the status of the airbag and the system was rewarded.  All of the child restraint types for which the iX is designed could be properly installed and accommodated in the car.

The iX has an 'active bonnet'. Sensors in the bumper detect when a pedestrian has been hit and actuators lift the bonnet to create more space between its surface and the hard components beneath. BMW demonstrated that the system worked robustly for various pedestrian statures and over a wide range of speeds and, accordingly, the car was tested with the bonnet in the deployed, raised, condition. Protection of the head of a struck pedestrian was good, or at least adequate, over almost the entire area tested by Euro NCAP. Similarly, the bumper provided good protection to pedestrians' legs at all test points. However, pelvis protection was poor over the width of the vehicle. The autonomous emergency braking system of the iX can detect vulnerable road users such as pedestrians and cyclists, as well as other vehicles. The system performed well in tests of its response to such road-users, with collisions avoided in most cases.

The iX has a seatbelt reminder system for the front and rear seats. ‘Attentiveness Assistant’ monitors steering inputs and driver controls to detect behaviour characteristic of fatigued driving, and advises the driver to rest when necessary. The lane support system gently corrects the vehicle's path when it is drifting out of lane and also intervenes in some more critical situations to stop the car from leaving the road, for example. A speed assistance system uses a camera and digital mapping to determine the local speed limit and provides the information to the driver, allowing the speed limiter to be set appropriately. The AEB system performed well in tests of its reaction to other cars.