I had the same codes for my 2002 F150 with 206,000 miles on it a month ago. Checked everything and I mean everything. Vacuum leak, intake manifold, vacuum tubes, O2 sensors, PCV, DPFE, MAP, Fuel Filter, injectors. I thought I was losing my mind. The only thing left was the fuel pump which I just couldn't believe because other than the codes and the high fuel trim readings there was no other symptom of a bad fuel pump.

Checked the fuel pressure at the rail, it was low. Dropped the tank, replaced the fuel pump. Fuel trim readings went back to normal, codes cleared. Do not overlook the fuel pump.

 

If you dont mind me asking...what was your fuel pressure?

 

Fuel rail pressure measured around 20 psi, at that point it was clear that the fuel pump was bad.

 

thanks. Mine is around 28. Think that's my problem too.

 

It's still surprising to me that my fuel pump was bad. But it makes sense in retrospect.

From what I read, the Fuel Pressure should be around 40 psi at idle. I guess the 20 psi I had was enough for the engine to run, but the computer kept calling for more gas, so my Long Term Fuel Trim was around +25 on both banks. If you get a scan tool and look at the fuel trims you should see very high readings which again leads to fuel pump failure (or lack of voltage or bad ground on a good fuel pump which I guess could also happen).

 

mine stays around 15. Spikes to 30 or higher occasionall .