The passenger compartment of the 2008 remained stable in the frontal offset test. Dummy readings indicated good protection of the knees and femurs of the driver and passenger. Peugeot showed that a similar level of protection would be provided to occupants of different sizes and to those sitting in different positions. In the full-width rigid barrier test, protection was rated as marginal for the neck of the driver and for the chest of both occupants. In the side barrier impact, protection of all critical body areas was good and the car scored full points in test. In the more severe side pole test, chest protection was rated as adequate and that of other body areas as 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 assessment of the rear seats also indicated good whiplash protection. For this assessment, the 2008 was equipped with the optional safety pack, which includes a more advanced AEB system than is fitted as standard. In tests of its functionality at the low speeds, typical of city driving, at which many whiplash injuries occur, the system performed well.

In the frontal offset test, protection of all critical body areas was good or adequate for both dummies. However, in the side barrier impact, chest protection was rated as poor for the 10 year dummy, based on measurements of chest acceleration. 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. One universal child restraint could not be properly installed in the rear outboard seats. Otherwise, all restraints types for the which the 2008 is designed could be properly installed and accommodated.

The bonnet provided predominantly good or adequate protection to the head of a struck pedestrian, with poor results recorded at the base of the windscreen and on the stiff windscreen pillars. The bumper provided good protection to pedestrians' legs and protection of the pelvis was also good at all test locations. The AEB system that is fitted as standard on the 2008 is able to detect pedestrians, as well as other vehicles. In tests of this functionality, the system performed adequately. A more advanced AEB system is offered as part of the optional safety pack which is also capable of detecting faster-moving road users such as cyclists.

The 2008 has a seatbelt reminder system for the front and rear seats. A lane support system helps prevent inadvertent drifting out of lane. The speed assistance system uses a camera to determine the local speed limit and this information is presented to the driver. The driver can choose to allow the system to adapt the speed limiter appropriately. The standard-fit AEB system performed adequately in tests of its response to other vehicles at highway speeds.