A computer implemented method for sensor analysis in an exhaust gas aftertreatment system EATS comprising a selective catalytic reduction SCR arrangement, wherein: - the SCR of the EATS is coupled downstream of an internal combustion engine and provided for treating exhaust gases from the ICE, - the EATS comprises a first nitrogen oxide NOX sensor arranged downstream of the SCR, - the EATS comprise a urea injector arranged at a first position upstream of the SCR, and - the EATS or the ICE comprises a processing unit, wherein the method comprises the steps of: - dosing, under control of the processing unit and using the urea injector, a first amount of a reductant into the exhaust gases when operating the ICE at a constant torque and constant revolutions per minute to generate a first constant flow of NOx, - receiving, at the processing unit, a first set of measurement data from the first NOx sensor indicative of an amount of NOx in the exhaust gases at the position of the first NOx sensor, - dosing, under control of the processing unit, a second amount of the reductant into the exhaust gases at the first position when operating the ICE at the first constant flow of NOx, wherein the second amount of the reductant is higher than the first amount of the reductant, - receiving, at the processing unit, a second set of measurement data from the first NOx sensor indicative of an amount of NOx in the exhaust gases at the position of the first NOx sensor, and - determining, using the processing unit, a scale factor for the first NOx sensor based on a combination of: - the first amount of the reductant, - the second amount of the reductant, - the first set of measurement data, - the second set of measurement data, and - a predefined NOx conversion ratio defining a first and a second expected amount of NOx in the exhaust gases at the position of the first NOx sensor for the first and the second amount of the reductant, respectively. - the SCR of the EATS is coupled downstream of an internal combustion engine and provided for treating exhaust gases from the ICE, - the EATS comprises a first nitrogen oxide NOX sensor arranged downstream of the SCR, - the EATS comprise a urea injector arranged at a first position upstream of the SCR, and - the EATS or the ICE comprises a processing unit, - dosing, under control of the processing unit and using the urea injector, a first amount of a reductant into the exhaust gases when operating the ICE at a constant torque and constant revolutions per minute to generate a first constant flow of NOx, - receiving, at the processing unit, a first set of measurement data from the first NOx sensor indicative of an amount of NOx in the exhaust gases at the position of the first NOx sensor, - dosing, under control of the processing unit, a second amount of the reductant into the exhaust gases at the first position when operating the ICE at the first constant flow of NOx, wherein the second amount of the reductant is higher than the first amount of the reductant, - receiving, at the processing unit, a second set of measurement data from the first NOx sensor indicative of an amount of NOx in the exhaust gases at the position of the first NOx sensor, and - determining, using the processing unit, a scale factor for the first NOx sensor based on a combination of: - the first amount of the reductant, - the second amount of the reductant, - the first set of measurement data, - the second set of measurement data, and - a predefined NOx conversion ratio defining a first and a second expected amount of NOx in the exhaust gases at the position of the first NOx sensor for the first and the second amount of the reductant, respectively. - the first amount of the reductant, - the second amount of the reductant, - the first set of measurement data, - the second set of measurement data, and - a predefined NOx conversion ratio defining a first and a second expected amount of NOx in the exhaust gases at the position of the first NOx sensor for the first and the second amount of the reductant, respectively.