Method for the exhaust gas aftertreatment of a diesel engine, which is connected by means of its outlet to an exhaust gas system, wherein a first SCR catalyst (48, 50) close to the engine is arranged in the exhaust gas system downstream of a turbine of an exhaust gas turbocharger and a second SCR catalyst is arranged downstream of the first SCR catalyst (48, 50) close to the engine, and comprising a first metering element, by means of which a reducing agent can be metered upstream of the first SCR catalyst (48, 50) into the exhaust duct, and comprising a second metering element, by means of which a reducing agent can be metered downstream of the first SCR catalyst (48, 50) into the exhaust duct, wherein the diesel engine comprises a high-pressure exhaust gas recirculation system which connects the exhaust gas system upstream of the turbine of the exhaust gas turbocharger to an intake tract downstream of a compressor of the exhaust gas turbocharger and has a low-pressure exhaust gas recirculation system which branches off from an exhaust duct of the exhaust gas system, downstream of the first SCR catalyst (48, 50) and upstream of the second metering element, also comprising means (38, 62, 88, 92, 94, 100) for determining an engine load of the diesel engine, of an exhaust gas mass flow, of an exhaust gas temperature (T EG) and a pollutant concentration in the exhaust gas system, wherein the method comprises the following steps: - identifying a load state of the diesel engine and/or an exhaust gas temperature (T EG) of the diesel engine, - comparing the exhaust gas temperature (T EG) with a first threshold temperature (T S1) and/or the engine load (P E) with a threshold load (Ps), wherein - at an exhaust gas temperature (T EG) below the first threshold temperature (T S1) or an engine load (P E) below the threshold load (Ps) the reducing agent is metered exclusively by the first metering element and exhaust gas recirculation takes place via the high-pressure exhaust gas recirculation system, wherein, at low engine loads, an uncooled exhaust gas recirculation of the exhaust gas flow returned via the high-pressure exhaust gas recirculation system takes place and at high engine loads a cooled exhaust gas recirculation of the exhaust gas flow returned via the high-pressure exhaust gas recirculation system takes place, wherein an exhaust gas recirculation valve in the low-pressure exhaust gas recirculation system is closed when the reducing agent is metered by the first metering element and an increase of an ammonia concentration in the exhaust gas flow of the diesel engine is detected downstream of the first SCR catalyst (48, 50), and wherein - at an exhaust gas temperature, (T EG) above the first threshold temperature (T S1) or an engine load (P E) above the threshold load (Ps), the reducing agent is metered exclusively by the second metering element, and exhaust gas recirculation takes place both via the high-pressure exhaust gas recirculation system and via the low-pressure exhaust gas recirculation system. - identifying a load state of the diesel engine and/or an exhaust gas temperature (T EG) of the diesel engine, - comparing the exhaust gas temperature (T EG) with a first threshold temperature (T S1) and/or the engine load (P E) with a threshold load (Ps), wherein - at an exhaust gas temperature (T EG) below the first threshold temperature (T S1) or an engine load (P E) below the threshold load (Ps) the reducing agent is metered exclusively by the first metering element and exhaust gas recirculation takes place via the high-pressure exhaust gas recirculation system, wherein, at low engine loads, an uncooled exhaust gas recirculation of the exhaust gas flow returned via the high-pressure exhaust gas recirculation system takes place and at high engine loads a cooled exhaust gas recirculation of the exhaust gas flow returned via the high-pressure exhaust gas recirculation system takes place, wherein an exhaust gas recirculation valve in the low-pressure exhaust gas recirculation system is closed when the reducing agent is metered by the first metering element and an increase of an ammonia concentration in the exhaust gas flow of the diesel engine is detected downstream of the first SCR catalyst (48, 50), and wherein wherein, at low engine loads, an uncooled exhaust gas recirculation of the exhaust gas flow returned via the high-pressure exhaust gas recirculation system takes place and at high engine loads a cooled exhaust gas recirculation of the exhaust gas flow returned via the high-pressure exhaust gas recirculation system takes place, wherein an exhaust gas recirculation valve in the low-pressure exhaust gas recirculation system is closed when the reducing agent is metered by the first metering element and an increase of an ammonia concentration in the exhaust gas flow of the diesel engine is detected downstream of the first SCR catalyst (48, 50), and wherein - at an exhaust gas temperature, (T EG) above the first threshold temperature (T S1) or an engine load (P E) above the threshold load (Ps), the reducing agent is metered exclusively by the second metering element, and exhaust gas recirculation takes place both via the high-pressure exhaust gas recirculation system and via the low-pressure exhaust gas recirculation system.