P0174 1997 Ford F150 -

Question

Just got a 97 f150, dealer said he changed an o2 sensor, now this code came up, what do I check first?

Answer 1

Hi there,

Start by looking for an intake manifold gasket leak on bank 2. It's fairly common on this engine and will cause the lean fuel trim code. If you don't have any leaks, then it's very possible the other sensor on that bank should be replaced as well.