How do you correct faults in the emission system when the codes show P0171 and P0174 for a 2000 Ford Taurus?

Answer 1

Good luck, have the same problem. Chasing a ghost. This points generally to vacuum. Check the elbow to the pcv valve under the intake past the mass airflow sensor. Mine was sucked colsed from being old. This did not fix the problem completely for me. I eventually got a Ford specific DTC code specifying the fuel pump driver module $120. Runs better still having the poblem when cold. I would not change the O2 sensors because they identify a problem. The codes point to spark, vacuum,or feul. Basically anything under the hood. A ford mech told me I could change every sensor under the hood and still not fix the problem. I have changed the feul filter, cleaned the Injectors, checked the vacuum, checked fuel pressure, the intake. cleaned the mass air flow sensor and am ready to burn the car. Garage in the family for 40 years and currently build helicopters. This one is a bitch. Hope for the elbow I mentioned. Be careful of the radiator hose that goes from radiator to the block. Where the hose splits there is a small hose comming off the top. This hose connects to a small plastic connector that is very easy to break getting to the elbow. It is out of the way enough but if you are not careful it is a $60 hose.