Welcome to JustAnswer, I'm Neal and I am here to assist you. Please feel free to ask follow up questions, it is part of the process.
If you were not getting the code before the new harness, there has to be an issue in the new harness or a connector, or there is a problem with the injector caused by the previous damage.
I had the code initially, and it hasn't gone away with the new harness. I also swapped out the injector in the process. Still the same code.
I ended up replacing the PCM. That fixed the problem.