a particle separator for treating the exhaust gases of an internal combustion engine includes at least one metallic layer through which exhaust gas can flow . the metallic layer is located in a housing that includes an inlet opening , an outlet opening and a central axis . the housing is provided with at least one inspection or maintenance opening that laterally penetrates the housing and provides a passage through to the metallic layer . the particle separator can , in particular , remain operational without having to be dismantled or can autonomously remain fully open to a flow at all times . a motor vehicle having at least one particle separator is also provided .