2003 325i BMW/M56 P0174 Code

Question

P0174 Code system too lean bank 2

Answer 1

HI there,

This code can be caused by several things, the most common when it's only one bank is either the front O2 sensor or in intake manifold leak. I would start by checking for an intake leak if the car is running rough. If not, then replace the front O2 sensor to resolve the issue.