PVTx measurements for carbon dioxide (CO(2), R744) + 1,1,1,2-tetrafluoroethane (CF(3)CH(2)F, R134a) for both two-phase and superheated vapor regions are presented. The measurements were taken with a constant volume apparatus at temperatures ranging from (233 to 373) K and pressures from (111 to 2915) kPa along 11 isochores. The data obtained in the two-phase region were used to derive vapor-liquid equilibrium (VLE) parameters using a flash method with the Carnahan-Starling-De Santis equation of state (CSD EOS). The results were compared with data existing in the literature. The results from the superheated region were compared with those predicted from the CSD EOS adopting parameters derived from the two-phase region data. A complete set of data was also compared with the REFPROP 9.0 prediction.