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DEF goes bad more than you think. If the vehicle had a sensor, component, or heater reporting a fault you get a CEL along with the DEF warning light and a message on the DIC: SERVICE EXHAUST FLUID SYSTEM or SERVICE EMISSION SYSTEM. When my heater failed I got the SERVICE EXHAUST FLUID SYSTEM message. We have seen other cars on the forum have bad sensors resulting in the message, but there is usually a CEL along with it.
 
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