Set Condition
WARNING: This page is about a different car, the 2017 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
The DEF Quality Sensor detects that the DEF concentration has fallen above or below a calibrated threshold, something other than DEF has been detected during the monitoring period, or the DEF Quality Sensor is unable to determine the DEF concentration value during the monitoring period.