Thank you all for the responses.
My question was more about the softwares that garages use to find failures and some I heard use it to optimize the engine so that it runs better in terms of fuel consumption and gaining a couple of more horse power.
Well now I know that there are no chip for Focus unlike what I earlier heard from a local chip tuner shop that they meant they can make my car more powerful by setting a chip.
What are your impressions of the softwares claiming to find the failures and helping for find the correct diagnose for an engine? are they worth a try?