THINKOBD 20, featuring full 10 modes of OBD2 functions, DTC Lookup, 1.77 in. LCD color display. It's truly an excellent OBD2 code reader that you should keep in your cars as a standard equipment. It enables DIYers and mechanics to do smog tests and solve basic engine and emission-related problems. Full OBD2 diagnosis Function: Read/Clear Codes, Live Data, Freeze Frame, I/M Readiness, O2 Sensor Test, On-Board Monitor Test, EVAP Test, Vehicle Information, DTC Lookup. Built-in DTC database, THINKOBD 20 can directly identify the code definition on the screen and no need to search. Gives you a more intuitive understanding of the problem and a budget.