my 2000 ford explorer is coming up system too lean bank 2 what do I do?

Question

I've changed the maf sensor, o2 sensors, egr valve, intake manifold gaskets, fuel filter, don't know what else to do.

Answer 1

P0174  Fuel trim lean Bank 2

Check vacuum leak especailly at the brake booster hose it has a tendency to crack and not show show itself . Low fuel pressure that is not at is specified pressure would code lean Bank but you would have both banks with a lean code condition. On a SOHC the fuel pressure specs are 55-65 psi. Another cause are mechanical concern where a cylinder leak down test would be the appropraite way to the cause of a lean code condition