How long does it take for the trouble code to go off after replacing temp sensor

I've been told that this same code that says a problem with temp sensor can also mean a problem may exist with the MAF sensor or dirty air filter - its not the filter and the MAF sensor looks clean and shiny - I'm trying to get car inspected to get tags on it - so I can't drive it on road - should I just unhook battery to clear and let codes go through cycle again - I have been jacking up the front end and putting it in drive to set the readiness codes since I can't drive on road yet - what do you think?