Amazon has an ‘easy to use’ OBD2 scanner on sale for 50% off

The iKiKin OBD2 Scanner Code Reader is on sale (for a limited time only) for $18, which is $18 off the original $36 price tag ...
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How to Use a Diagnostic Car Code Reader

Have your owner’s manual handy. Place your vehicle in “park,” or “neutral” for a manual transmission. Firmly set the parking brake. Download and install the manufacturer’s code reader app to your ...