P1073= fuel trim malfunction bank 2. Some tends to think in terms of a faulty O2 sensor. This code could be attributed to many problems like vacuum leaks, bad fuel injectors, bad intake gaskets, fuel pressure regulator and the list goes on.
Once had P1174 & P1175 did a vacuum leak test on the intake by spraying brake fluid cleaner which confirmed that the intake gaskets went south. Good luck