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The current study focuses on the operating behavior of a NOx-adsorber catalyst upstream of a Diesel particulate filter as two separate exhaust gas aftertreatment components. New European drive cycle (NEDC), US FTP 75, and US06 tests with a NOx-adsorber have been performed with and without a DPF in two passenger cars with initial test weights (ITW) between 1550 and 1750 kg. Transient particle size distributions have also been measured during FTP 75 and US06 tests. Also on road driving with a NOx-adsorber and DPF has been carried out. During these tests, the focus has been on the NOx-adsorber catalyst and on the interaction between the NOx-adsorber and the DPF. The purge events to regenerate the NOx-adsorber (rich exhaust gas composition,λ < 1) have been controlled automatically via new engine control unit functionalities. These algorithms have been developed using the rapid prototype tool ETAS ASCET.