Plug-in sensor having an optimized flow outlet

A plug-in sensor for determining at least one parameter of a fluid medium flowing in a main flow direction of an intake air mass of an internal combustion engine flowing through a flow pipe, the plug-in sensor comprising:

• a plug part adapted to be mounted in the flowing fluid medium at a predefined alignment to the main flow direction, the plug part having at least one flow channel having at least one inlet opening and at least one outlet opening;
• and at least one sensor situated in the at least one flow channel, the at least one sensor adapted to determine the at least one parameter;
• wherein the plug part has a profile at which an at least local pressure minimum sets in the flowing fluid medium, the at least one outlet opening being situated on a side of the plug part in an area of the at least one pressure minimum, wherein the at least one flow channel has at least one main channel and at least one bypass channel, the at least one sensor situated in the bypass channel, wherein the bypass channel branches off from the main channel adjacent to the at least one inlet opening, wherein the at least one outlet opening includes i) at least one main flow outlet of the at least one main channel, and ii) at least one bypass outlet of the at least one bypass channel, wherein the plug part has at least partially an airfoil profile so that when the plug part is mounted in the flowing fluid medium, an asymmetrical flow profile of the fluid medium sets in having a high pressure side and a low pressure side, the at least one outlet opening being situated on the low pressure side.