87F0E4 Mercedes Fault Code :
Read the description of 87F0E4 in ACM21T and the engine lights up for ACM21T Aftertreatment Control Module code, there are some possible causes for it.
The ratio of rpm to pressure at component '17M03: AdBlue supply unit motor' is faulty.The rpm of component '17M03: AdBlue supply unit motor' is too low.