Ford taurus se 2004

Question

Ok so ive been having problems with this car since i bought it. Bad gas mileage for one. Had place i got it from put it on the computer and said it was a bad coil pack. Ive replaced the coil pack not only once but twice. Ive replaced spark plugs and also a cam sensor. Check engine lights back on and i failed emissions test due to p0171 the car hasnt been driven in almost two years, could that be part of the reason for the p0171 code??

Answer 1

Most causes for a P0171 is due to unmetered air entering into the engine which is a vacuum leak, or low fuel pressure, If the vehicle has not been driven in two years check the PCV vacuum hose connection these tend to rupture if not rupture tends to collapse when the engine is running.