Autel MaxiScan MS300 Yes, you can pass inspection with that

Great tool. Saved me over $800 in parts and labor for a new catalyst converter on my Mitsubishi Galant. If you have the P0421 code on you OBDII follow this and you might get lucky: read the codes, erase them, drive some 40 miles to get indicators back to "ready", let the car to cool down overnight and go to inspection. Still, one of my indicators "EVAP" wasn't ready before I went to the inspection station but I could still pass.