SOURCE: diagonostic trouble codes reported p0171
P0171 is system too lean bank 1, P0174 is too lean bank 2, and 302 is misfire bank 1. Look for vacuum leaks. If you don't find them, put a vacuum gage on it can check. The P0171 is almost always a vacuum leak. If not other possibilities are front O2 sensor is too old and should be replaced (if mileage is greater than 100k then replace). Try injector cleaner. Misfires are usually bad spark plugs, but could possibly be caused by insufficient fuel. I've never had a car of mine in bad enough shape to have that error.
SOURCE: 1999 ford taurus emission reading p0171 and p0174
just tune up ur car periodicly, clean filter. clean ur sparkplug.
SOURCE: OBD codes P0171 and P0174
Look on the passenger side of the intake at the rubber elbow attached to the big black plastic tube and then to the intake manifold. Make sure it is not sucking shut and maybe a small hole in the bottom of it.
SOURCE: poor idle dtc P1151, P1131,P0174, P0171. runs ok
Change plugs, and Mass Air Flow sensor. This should do the trick
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