87F0E4 Mercedes Fault Code :
Read the description of 87F0E4 in ACM02T and the engine lights up for ACM02T - Exhaust aftertreatment (17A03) code, there are some possible causes for it.
The ratio between rpm and pressure of the AdBlueŽ delivery pump at component '17A05 (AdBlueŽ supply unit control unit)' is too low.