System and a method for determining a correct or incorrect position of a temperature sensor of an emission control system

A system for determining a correct or an incorrect position of a temperature sensor for measuring a prevailing temperature in an emission control system of a combustion engine, comprising:

• means arranged for determining with a model a first reference temperature at a location in the emission control system within a first temperature interval corresponding to a first operational condition;
• means arranged for measuring a first temperature by means of said temperature sensor corresponding to said first temperature interval;
• means arranged for determining with the model a second reference temperature at the location in the emission control system within a second temperature interval corresponding to a second operational condition, wherein said second temperature interval differs from said first temperature interval;
• means arranged for measuring a second temperature by means of said temperature sensor corresponding to said second temperature interval;
• means arranged for determining a value for a characteristic parameter based on said first reference temperature, said first measured temperature, said second reference temperature and said second measured temperature;
• means arranged for comparing said determined value for said characteristic parameter with a predetermined characteristic parameter threshold value, said predetermined characteristic parameter threshold value being based upon determined operation parameter results for different positions of said temperature sensor for predetermined engine operation characteristics;
• and
• means arranged for, based upon said comparison, determining a correct or an incorrect position of said temperature sensor.