The subject invention relates to an air spring (1) with a distance measurement sensor (100), an energy transforming unit (200), a first mounting element (10) being adapted for being mounted to a first vehicle portion (2) and a second mounting element (20) being adapted for being mounted to a second vehicle portion (3). An air volume (50) is arranged between the first mounting element and the second mounting element. The energy transforming unit is adapted to transform a transition of the air spring from a first state (s1) of the air spring to a second state (s2) of the air spring into electrical energy and to provide the generated electrical energy to the distance measurement sensor. The energy transforming unit is arranged in the air volume (50) of the air spring.