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5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
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
Billb
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