I downloaded the OBD Auto Doctor app (one of two suggested apps) and followed the connection steps that came with the device. I was able to connect to my Android phone very easily. , and tested the device on my 2018 Toyota RAV4. The free app had enough information for what I needed. To get a more complete diagnosis I could upgrade to the full version for a fee. I'm going to try the unit on a 2002 Trailblazer that I actually bought for diagnostic purposes. I will update my review as soon as I have a chance to test it. Part 2: I have now used this device on a 2002 Trailblazer. I have no problem reading OBD data. The only problem was connecting the device. Due to the location of the ODB port in relation to the dashboard, there was not enough space to install the scanner. I had to loosen 2 screws holding the connector in place. After the screws were loosened (NOT REMOVED), I was able to move the port away from the dash just far enough to mount the scanner.
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