do any one know what fuel trim codes mean , i have a po170 and po173 dtc code and my book just says fule trim malfunction any help?

Jump all over you because you didn't leave your make year and model, BUT I won't. Is your CEL on? Those codes are usually indicitive of a bad Mass Air Sensor. Good Luck!

.. or any other of 50 reasons , from a vac leak to a bad fuel pressure regulator diapragm..
..and model info will only assist someone willing to help you out, as different models have specific known code producing problems .
An EGR code on 104 engines model would get you a diagnosis probable of a plugged EGR tube at the intake b/c they are infamous on that MODEL chassis, but that same code diagnostics would be different on another chassis/model..
..So, the upside of model info is to the posters advantage , not just us jerk/techs who complain about no model info as we freely try to give each post a correct diagnosis..

So, could you Please give us a model number. Sir .. so we may assist you in your problem ...

Thanks pal....