After I Buy Autel MaxiScan MS300 CAN Diagnostic Scan Tool for OBDII VehiclesI thought I had a bad unit with LINK ERROR on two different cars. You will never see the MAXISCAN MS300 display on the LCD, as described in the manual. Here are the real steps to follow:
1. With the ignition off plug it in. I immediately saw CAN OBD2 on the LCD.
2. Turn the ignition switch to the ON position. This is the position just before you crank the starter. Do not start the vehicle.
3. Then press the ENTER button on the reader which starts the scan.
4. Use the SCROLL button on the reader to view the results.
This is a handy tool, but almost any auto parts store will do a free code scan for you (Auto Zone, O'Reilly, Champion...), so that might be a cheaper way to go if you don't expect to use it much. An auto repair shop can charge you $100 or more to do the same, depending on where you are in the country.
The manufacturers website [...] and manual appear to be done by a novice "Chinese to English" transalator, so can be cryptic as best and totally misleading at worst.
Note that just resetting the code will not let you pass inspection. The sensors have to return a ready/OK code for the emissions test. It takes driving several miles for the sensors to retest and get back to the ready/OK status.
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