This vehicle is equipped with a Diesel Exhaust Fluid (DEF) injection system and a Selective Catalytic Reduction (SCR) catalyst to meet the emission requirements.
The DEF injection system consists of the following components:
DEF tank
DEF pump
DEF injector
Electronically-heated DEF lines
DEF control module
NOx sensors
Temperature sensors
SCR catalyst
UQS Sensor
For system messages and warnings INSTRUMENT CLUSTER DISPLAY.
Your vehicle is equipped with a DEF injection system. You may occasionally hear an audible clicking noise. This is normal operation.
The DEF pump will run for a period of time after engine shutdown to purge the DEF system. This is normal operation.