It resets the check engine lights, reads and clears all generic, and some manufacturer specific. Newest!!! 2012 latest!!! D900 CANBUS OBD2 Live PCM Data Code Reader 2012 VersionDescription:1.D900 has CAN Protocol Support which gives wider vehicle coverage. 2.It resets the check engine lights, reads and clears all generic, and some manufacturer specific, DTC, displays the I/M readiness status, ...