Electrochemical sensor for detecting a predetermined gas component in a gas and/or for measuring the concentration of the gas component in the gas, wherein the electrochemical sensor comprises - a housing that encloses an interior space, - a measuring cell (2, 4, 12, 15) in the interior space, - an electrical measuring unit, - a measuring-cell-side inlet (Ö) in the housing and - an oxidation component in the interior space, wherein the measuring-cell-side inlet (Ö) is capable of establishing a fluid connection between the housing and an environment of the electrochemical sensor, wherein the measuring cell (2, 4, 12, 15) comprises - a measuring electrode, - a counter electrode and - an electrically insulating and ionically conductive layer between the two electrodes (2, 4), wherein the measuring cell (2, 4, 12, 15) is designed in such a way that a chemical reaction takes place at the measuring cell (2, 4, 12, 15), which - depends on the concentration of the gas component in the interior space and - influences a measurable electrical quantity, and wherein the electrical measuring unit is designed to measure a measure of the influenced electrical quantity, characterized in that the electrochemical sensor comprises a pressure equalization outlet in the housing, wherein the pressure equalization outlet is capable of establishing a fluid connection between the housing and an environment of the electrochemical sensor, wherein the measuring cell (2, 4, 12, 15) is arranged between the measuring-cell-side inlet (Ö) and the pressure equalization outlet and wherein the oxidation component - is arranged between the pressure equalization outlet and the measuring cell (2, 4, 12, 15) and at a distance from the measuring cell (2, 4, 12, 15), - comprises at least one electrode, preferably two electrodes (6.1, 6.2), - is electrically insulated from the measuring cell (2, 4, 12, 15), - is arranged and designed to oxidize at least one, preferably every oxidizable component in the gas which passes through the pressure equalization outlet into the interior space, and - is preferably connected to the measuring cell (2, 4, 12, 15) in an ionically conductive manner. wherein the electrochemical sensor comprises - a housing that encloses an interior space, - a measuring cell (2, 4, 12, 15) in the interior space, - an electrical measuring unit, - a measuring-cell-side inlet (Ö) in the housing and - an oxidation component in the interior space, - a housing that encloses an interior space, - a measuring cell (2, 4, 12, 15) in the interior space, - an electrical measuring unit, - a measuring-cell-side inlet (Ö) in the housing and - an oxidation component in the interior space, wherein the measuring-cell-side inlet (Ö) is capable of establishing a fluid connection between the housing and an environment of the electrochemical sensor, wherein the measuring cell (2, 4, 12, 15) comprises - a measuring electrode, - a counter electrode and - an electrically insulating and ionically conductive layer between the two electrodes (2, 4), - a measuring electrode, - a counter electrode and - an electrically insulating and ionically conductive layer between the two electrodes (2, 4), wherein the measuring cell (2, 4, 12, 15) is designed in such a way that a chemical reaction takes place at the measuring cell (2, 4, 12, 15), which - depends on the concentration of the gas component in the interior space and - influences a measurable electrical quantity, and - depends on the concentration of the gas component in the interior space and - influences a measurable electrical quantity, and wherein the electrical measuring unit is designed to measure a measure of the influenced electrical quantity, characterized in that the electrochemical sensor comprises a pressure equalization outlet in the housing, wherein the pressure equalization outlet is capable of establishing a fluid connection between the housing and an environment of the electrochemical sensor, wherein the measuring cell (2, 4, 12, 15) is arranged between the measuring-cell-side inlet (Ö) and the pressure equalization outlet and wherein the oxidation component - is arranged between the pressure equalization outlet and the measuring cell (2, 4, 12, 15) and at a distance from the measuring cell (2, 4, 12, 15), - comprises at least one electrode, preferably two electrodes (6.1, 6.2), - is electrically insulated from the measuring cell (2, 4, 12, 15), - is arranged and designed to oxidize at least one, preferably every oxidizable component in the gas which passes through the pressure equalization outlet into the interior space, and - is preferably connected to the measuring cell (2, 4, 12, 15) in an ionically conductive manner. - is arranged between the pressure equalization outlet and the measuring cell (2, 4, 12, 15) and at a distance from the measuring cell (2, 4, 12, 15), - comprises at least one electrode, preferably two electrodes (6.1, 6.2), - is electrically insulated from the measuring cell (2, 4, 12, 15), - is arranged and designed to oxidize at least one, preferably every oxidizable component in the gas which passes through the pressure equalization outlet into the interior space, and - is preferably connected to the measuring cell (2, 4, 12, 15) in an ionically conductive manner.