Bought the unit to quickly identify problems with the "Check Engine Indicator (CEL)". $20 codes are fine, but the CEL light may come on for trans/abs/srs issues that cannot be viewed or cleared with "FIXD". As for the CRP-123, after downloading the necessary information via Windows (it didn't work for me via Chromebook) simply plug in the reader as directed (read the user manual first) and then follow the instructions. At the moment this is a great product for the price, you can't beat it as you are spending the same amount to go to the retailer once. And VIP or Autozone read it for free.
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