Ahahaha... THAT is very true; just like "BMW Certified Technician isn't always a good thing"

Read, learn, and draw your own conclusions: don't believe everything you read on forums and don't believe anything the service advisors tell you. The important things to know is that 6-Sigma and QA not only improved the repetitivity of process as a prerogative to quality; but also results in the repetitivity of issues: meaning 99.9% of the time you have an issue, someone else had it. Forums have a broader user base than your local dealership and allow to see the recurrance of issues.

Now, back to your issue.

That code has to do with the temperature sensor in the active tank. You can thank BMW and Bosch for having to replace the whole damn tank for a stupid temperature sensor. But yea, it happens quite often.

Replacement of the tank requires the removal of the front bumper and then it's right there. The price of the active tank has come down substantially and it's now around 900 bucks from the initial 1400. There's reconditioned unit for sale by a Canadian supplier that go for 450 but I doubt a BMW dealer would use it.
You can find the tank online for 20% for a net of 788.58 (BMW Parts and Accessories | GetBMWParts.com). If your dealer doesn't want to match that ask them the list of parts they need and you will supply it to them.

You're in FL: on one side you have very lax emission regulations, on the other you don't get CA Emission Warranty that may have covered you...

You can obviously continue to drive with your CEL on and forget about it.

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