Pressure sensor intended to be mounted on a member of a vehicle engine, comprising: - a printed circuit board having at least one pressure-sensitive element (2a, 2b) electrically connected to the printed circuit board, and - a protective housing in which the printed circuit board and the pressure-sensitive element (2a, 2b) are housed, the protective housing comprising a chamber at atmospheric pressure, the pressure-sensitive element (2a, 2b) comprising a first face in fluidic communication with a cavity (8a, 8b) connected to a pressure inlet (P1, P2) for measurement of a pressure in the member of the engine, and a second face, opposite to the first face, in fluidic communication with the chamber, the chamber and the cavity (8a, 8b) being separated from one another hermetically by the pressure-sensitive element (2a, 2b), the chamber being partially delimited by an outer envelope comprising two separate air circulation paths (11, 12) that are connected to the atmosphere, namely a first air circulation path and a second air circulation path, the outer envelope being positioned at a lower part of the protective housing, said lower part being intended to be oriented towards a bottom part of the vehicle when the pressure sensor is mounted on the member of the vehicle engine, characterized in that the outer envelope comprises a peripheral wall formed on a body of the protective housing, surrounding the chamber, and a removable cover comprising a main face which fits into the peripheral wall of the body so as to close the chamber, the two air circulation paths (11, 12) being formed between the peripheral wall of the body and the cover. - a printed circuit board having at least one pressure-sensitive element (2a, 2b) electrically connected to the printed circuit board, and - a protective housing in which the printed circuit board and the pressure-sensitive element (2a, 2b) are housed, the protective housing comprising a chamber at atmospheric pressure, the pressure-sensitive element (2a, 2b) comprising a first face in fluidic communication with a cavity (8a, 8b) connected to a pressure inlet (P1, P2) for measurement of a pressure in the member of the engine, and a second face, opposite to the first face, in fluidic communication with the chamber, the chamber and the cavity (8a, 8b) being separated from one another hermetically by the pressure-sensitive element (2a, 2b), the chamber being partially delimited by an outer envelope comprising two separate air circulation paths (11, 12) that are connected to the atmosphere, namely a first air circulation path and a second air circulation path, the outer envelope being positioned at a lower part of the protective housing, said lower part being intended to be oriented towards a bottom part of the vehicle when the pressure sensor is mounted on the member of the vehicle engine, characterized in that the outer envelope comprises a peripheral wall formed on a body of the protective housing, surrounding the chamber, and a removable cover comprising a main face which fits into the peripheral wall of the body so as to close the chamber, the two air circulation paths (11, 12) being formed between the peripheral wall of the body and the cover.