I don't have my own tester but have tried both AutoZone and O'Riley's and neither of them would bring anything up. And thank you for the welcome this is my first experience with a 7.3 and I think I'm in love lol!
Welcome to psn.
You need a diesel specific code reader. Most parts store scanners will not read diesel codes.
Invest in a obdlink mx adapter, then download torque pro app to your phone. This will let you read codes, and monitor a lot of things on your truck.
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