Question

P0174 code comes up 2003/325i M56. what parts might need to be replaced system lean Bank 2

Answer 1

P0174 Fuel trim lean Bank 2

Lean fuel trim is a condition of the engine , Bank 2 are cylinder 4,5,6. What can set a lean codes are usually vacuum leaks such as the fuel injector seal, the oil cap,the purge vacuum hose,  or the manifold gasket.

Lean fuel trim are condition which can occur  from vacuum leaks such as the fuel injector seal, the oil cap, the purge hose

Sparkplug are also important to check, a loose sparkplug that is not properly torque down can set a lean code, And in this case this BMW was burning oil which was the case of a lean condition.