I do not know the codes its showing. P0174 help?

there is no such code

Yes there is, the code P0174 on a 2002 Ford Taurus indicates a "System Too Lean (Bank 2)" condition. This can be caused by a misfire or a bad fuel injector on the bank 2 side. You might have a vacuum leak as well, please go over this guide to help.

https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

Please go over this guide and get back to us.