The invention relates to an internal combustion engine comprising at least one line system for secondary air. A module body comprises a portion of the lines (25, 30, 35), a portion of the actuating valves (26a, 31, 26b), and check valves (27). The throttle valve (13) and its actuator (36) are additionally integrated in said module. A line section (14) which is part of the intake system (11) is also integrated in the module. The admissions of the lines (35, 30) are easily realized in said line section. The line (30) is intended for recirculating exhaust gas. It is also possible to partially realize the depicted idea with regard to integration. It is also possible to simultaneously utilize the supply line (29) in the exhaust (21) of the internal combustion engine as a bleed line for the exhaust gas. All of these measures are suited for reducing the installation space and the number of components for the internal combustion engine, whereby they yield very economical solutions.