A method is made available for monitoring a pressure sensor (18) in a pressure-controlled delivery and metering system for a liquid reactant of a catalytic converter, in particular of an SCR catalytic converter. The delivery and metering system is provided for delivering the reactant from a tank (10) and for metering the reactant via a pressure line (16) and a metering module (19). In order to monitor the pressure sensor (18) which is located in the pressure line (16), a flow rate measurement is carried out in the pressure line (16) and/or in a return path (17) taking into account the relationship between the pressure p and the corresponding flow rate v.