Question

2006 Ford Freestar 3.9L with multiple codes P0300, P0302, P0303, and P0174. What could be the problem?

Answer 1

Hi there,

The P0174 code indicates a lean condition on bank 2. Since you also have misfires on that bank i would check it for intake manifold leaks. If there aren't any then the next step would be to replace the front O2 sensor. This can cause a lean mix and also a problem with the misfires.

Answer 2

P0174 Ford Code - Fuel Injection System Too Lean Bank 2
Read more: https://www.autocodes.com/p0174_ford.html