Have also found many things that are in memory but do not set the light (most say if the light is on or not.) At the moment have two that can do in depth scanning, an Autel DIaglink (under $100 on Amazon) and an Autel MS-906 I acquired. Plus a MicroPod I have not set up yet and Carly for Mercedes am getting updated.

This is an example:
Read Codes
C1140-128 Stored
N49 (Steering angle sensor) :Steering angle sensor is not initialized.
C1141-2 MIL ON&Stored&Current Pressure sensor :
B34/1 (ESP pressure sensor 1) : Electrical fault

Replaced the sensor (0015427518) and all faults cleared, lights out. But again you need a scanner that can read modules (ESP, BAS, RFI, ABS, etc) as well as OBD codes.