Hello and thank you for using JustAnswer.com
How many miles are on the truck?
Let me know, thanks Jay!
Darn, I was hoping you had less mileage. When you have a Catt Converter code, the 02 sensors have detected that the Catt Converter is no longer functioning properly and should be checked. If you use a scan tool to monitor and graph 02 sensor operation you should be able to see if the Catt Converters are working properly or not. If not, they will need to be changed. Failure to ignore changing them can allow them to eventually get broken up and the debris could enter the engine contaminating the engine to the point you will start burning oil and then you will eventually need a new engine. So I would not ignore that code. As for the black smoke, you would need to check your air and fuel mixture readings. If the truck is running rich, that could be the cause of the Catt Converter failure. You can get black smoke when the car is running rich. So that also should be checked.
If you have any more questions on this, please feel free to ask. Thanks Jay!