Why You Need MUCAR CDL20? Featuring all modes of OBDII functions, DTC Lookup, Plug and Play etc., it is truly the ultimate entry-level choice in ease and affordability, enabling DIY users to verify repairs, road test, check state emission monitor status and solve basic engine and driveability problems. Full OBD2 Functions *-Read extensive current, pending and permanent codes in OBD system quickly*-Clear detected fault codes and turn off the Check Engine Light efficiently*-View graphical live data of vehicle's computer module(s) for easy analyses*-View the vehicle's operating parameters at the moment a DTC is detected*-Read I/M readiness status to have a vehicle inspected for state emissions compliance*-Perform O2 sensor test to check fuel efficiency and vehicle emissions*-Read the results of on-board diagnostic monitoring tests for specific components/systems*-Retrieve the vehicle information of VIN, CINs, and CVNs completely*-Perform the component Test by allowing initiating a leak test for the vehicle's EVAP system Reset Check Engine Light