An exhaust gas aftertreatment system (110; 110') for receiving exhaust gases from an internal combustion engine, the EAT system comprising: a particulate filter; an oxidation catalyst upstream of and adjacent to the PF; a pressure differential sensor configured to measure a pressure differential between a first measurement position upstream of the OC and a second measurement position downstream of the PF and wherein there are no sensors for determining a parameter of the exhaust gases located between the OC and the PF; characterized by: a selective catalytic reduction system downstream of the PF, the SCR system including an exhaust fluid dosing module for introducing an EF into the exhaust gas flow downstream of the PF and a SCR catalyst downstream of the EF dosing unit; an upstream NOx sensor for detecting NOx levels in the exhaust gases upstream of the OC; a downstream NOx sensor for detecting NOx levels in the exhaust gas downstream of the SCR catalyst; an upstream OC temperature sensor for sensing the exhaust gas temperature upstream of the OC; and at least one intermediate temperature sensor (138, 142) for sensing the EGT downstream of the PF and upstream of the SCR catalyst; and wherein: a) the EAT system has two intermediate temperature sensors, one downstream of the PF and upstream of the EF dosing module and one downstream of the EF dosing module and upstream of the SCR catalyst; or b) the EAT system has a single intermediate temperature sensor located downstream of the EF dosing module and upstream of the SCR catalyst. a particulate filter; an oxidation catalyst upstream of and adjacent to the PF; a pressure differential sensor configured to measure a pressure differential between a first measurement position upstream of the OC and a second measurement position downstream of the PF and wherein there are no sensors for determining a parameter of the exhaust gases located between the OC and the PF; characterized by: a selective catalytic reduction system downstream of the PF, the SCR system including an exhaust fluid dosing module for introducing an EF into the exhaust gas flow downstream of the PF and a SCR catalyst downstream of the EF dosing unit; an upstream NOx sensor for detecting NOx levels in the exhaust gases upstream of the OC; a downstream NOx sensor for detecting NOx levels in the exhaust gas downstream of the SCR catalyst; an upstream OC temperature sensor for sensing the exhaust gas temperature upstream of the OC; and at least one intermediate temperature sensor (138, 142) for sensing the EGT downstream of the PF and upstream of the SCR catalyst; and wherein: a) the EAT system has two intermediate temperature sensors, one downstream of the PF and upstream of the EF dosing module and one downstream of the EF dosing module and upstream of the SCR catalyst; or b) the EAT system has a single intermediate temperature sensor located downstream of the EF dosing module and upstream of the SCR catalyst. a selective catalytic reduction system downstream of the PF, the SCR system including an exhaust fluid dosing module for introducing an EF into the exhaust gas flow downstream of the PF and a SCR catalyst downstream of the EF dosing unit; an upstream NOx sensor for detecting NOx levels in the exhaust gases upstream of the OC; a downstream NOx sensor for detecting NOx levels in the exhaust gas downstream of the SCR catalyst; an upstream OC temperature sensor for sensing the exhaust gas temperature upstream of the OC; and at least one intermediate temperature sensor (138, 142) for sensing the EGT downstream of the PF and upstream of the SCR catalyst; and wherein: a) the EAT system has two intermediate temperature sensors, one downstream of the PF and upstream of the EF dosing module and one downstream of the EF dosing module and upstream of the SCR catalyst; or b) the EAT system has a single intermediate temperature sensor located downstream of the EF dosing module and upstream of the SCR catalyst. a) the EAT system has two intermediate temperature sensors, one downstream of the PF and upstream of the EF dosing module and one downstream of the EF dosing module and upstream of the SCR catalyst; or b) the EAT system has a single intermediate temperature sensor located downstream of the EF dosing module and upstream of the SCR catalyst.