A method for mutual 
adaptation of a delivery module and a metering module of an exhaust emissions 
control system that has an 
exhaust gas conduit and a control module, the delivery module having a reservoir that has a venting valve and contains a 
uric acid solution that is conveyed via a delivery pump to a pressure regulating valve; and in the metering module, an air 
stream being compressed with the aid of a pump, conveyed to a pressure accumulator, and conveyed via a regulating valve, together with the 
uric acid solution, out of the pressure regulating valve to a metering valve, and being conveyed from there to an atomizer unit disposed in the 
exhaust gas conduit, the value of a reference pressure based on the pressure forming in the 
exhaust gas conduit being stored in the control module. A method for mutual 
adaptation of a delivery module and a metering module of an exhaust emissions 
control system having a control module, a respective parameter or characteristic curve being created for the delivery module and for the metering module and being introduced into the respective module as a 
machine-readable code. An apparatus for mutual 
adaptation of a delivery module and metering module for an exhaust emissions 
control system having an exhaust gas conduit and a control module, the value of a reference pressure based on the pressure forming in the exhaust gas conduit in the context of a calibration cycle being stored in the control module. A mutual adaptation of any arbitrary metering and delivery modules can thereby be implemented in a simple and economical fashion.