5BF0E4 Mercedes Fault Code :
Read the description of 5BF0E4 in ACM02T and the engine lights up for ACM02T - Exhaust aftertreatment (17A03) code, there are some possible causes for it.
The output for actuation of component '17A04 (AdBlueŽ metering unit control unit) / AdBlueŽ heating element' has a short circuit to ground.