Non-intrusive reductant injector clogging detection

A computer-implemented method for determining whether a reductant injector is clogged, comprising:

• receiving data indicative of at least i) an injector duty cycle for the reductant injector and ii) a pump duty cycle for a pump providing reductant to the reductant injector;
• providing the data as input to a determination module, wherein the determination module uses one or more machine learning algorithms trained to, based on the data indicative of the injector duty cycle and the pump duty cycle, infer a set of one or more statistics including at least a first value) indicative of a probability of the reductant injector being clogged, and
• providing, based on the one or more statistics, an indication of whether the reductant injector is clogged.