SOURCE: I have 2000 Ford Taurus reading a code of PO174
WELL YOU MAY HAVE A VACUM LEAK IN IN TAKE AREA OR HOSE OR MASS FLOW AIR SENSOR THERE COULD BE SOME OTHERE THING BUT I WOULD LOOK FOR VACUM LEAK BUT COULD BE O2 SENSOR
SOURCE: failed smog test because of fault code po174 :
Leak on the intake, bad EGR valve that's not closing. Perhaps a bad O2 sensor, but probably not. The O2 sensor is what detects a rich/lean condition. But when they fail they usually give their own error codes.
SOURCE: 2003 Ford Expedition check engine light on .Codes PO171 & PO174
This is a tough one could be mass air flow sensor ,oxyegen sensors,a fuel filter. a vacum leak, a pcv valve if i missed anything just google po 171 &174 look for fix ya this issue has been addressed many times first check the vacum lines includeing the line on the pcv valve for cracks or splits in the lines .I would do the fuel filter if it hasnt been changed in the last couple of years , if still a problem the MAF sensor if your happy with my advise please leave me with great feedback
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