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The effect of sulfur concentration in gasoline fuel on emissions from vehicles equipped with lean NOx catalyst (LNC) was studied. The durability of the emission control systems against sulfur poisoning was evaluated using three recently launched vehicles under mileage accumulation tests. The major elements for the NOx trap function of the lean NOx catalysts evaluated in this study were Ba, Na and/or K. The range of sulfur contents of the test fuels was 3 to 80 ppm. The mileage accumulation was conducted up to 10,000 km mainly with Japanese 11 lap mileage accumulation driving cycle where the average and maximum velocities are 46 and 100 km/h respectively. The effects of vehicle velocity on emissions were also investigated by modifying the mileage accumulation driving cycle. As a result, it was found that the durability of the emission control systems against sulfur poisoning has been remarkably improved with the recently launched vehicles.