P0172 Ford -

Question

2004 explorer, po172 keeps coming up. new air,gas maf sensor, downstream o2 sensor, intake manifold gaskets, fuel rail sensor. smoker showed no leaks. Had a po171, changed the bank 2 sensor & that went away, then this came up. any suggestions?

Answer 1

P0171 Fuel trim lean Bank 1

P0172 Fuel trim lean Bank 2

Fuel pressure regulator can cause this , a vacuum leak at the regulator where there is no vacuum to the regulator at idle can cause a rich condition, or can a leaking fuel regulator cause this.

 Here a Ford that was check for a P0172 and a P0171, what was check was the fuel pressure regulator, at idle there was no vacuum for the fuel regulator.

 The problem was fix when a vacuum hose for the fuel regulator was found to be broken restoring vacuum line solved P0171 and P0172

Answer 2

P0171 Fuel trim lean Bank 1

P0172 Fuel trim lean Bank 2

Fuel pressure regulator can cause this , a vacuum leak at the regulator where there is no vacuum to the regulator at idle can cause a rich condition, or can a leaking fuel regulator cause this.

 Here a Ford that was check for a P0172 and a P0171, what was check was the fuel pressure regulator, at idle there was no vacuum for the fuel regulator.

 The problem was fix when a vacuum hose for the fuel regulator was found to be broken restoring vacuum line solved P0171 and P0172