To me ethics and morals are the same thing. If you feel bad about either you are most likely doing bad. Some times you have to do things others think are ethically wrong, but how does it feel? Are you hurting anyone? Are you creating a bad or untruthful situation? Like I say it should not feel bad to do something. We, being in a journalistic profession, constantly hear about being truthful and honest so we know we should not mess up.
Ethics is not just in writing it is in your life, but you could mess up and think you are doing right and you really are doing something wrong. But you learn from you mistakes and you correct them (hopefully you do not get fired from your job). If you question yourself ask someone you really trust or admire them for the honesty and truthfulness.
The worst thing you could do is just make stuff up, and unfortunately that happens a lot– thanks to the internet and people loving to blog about their opinions and others taking it seriously. You now, as a writer, have a moral obligation to not fool your readers. You want to gain their trust and you should never lead them into a lie.
If you writing seems like it would be better because of “lies” just look at the words you are using try to create a better story with better words– not false words just more exciting words.