Question about 2004 Ford Taurus

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P0171 Went to auto zone and had it put on the machine and it came up with P0171 and P0174 was what was showing up can you tell me what to do and were it is at on my motor so I can fix it.

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There are a number of things that can cause these codes to come up (they mean bank 1 and bank 2 lean fuel mix, which is too much air, or not enough gas ), Here are some possibilities:
common on fords--bad differential pressure sensor (DPFE), this sensor is located on the engine near the EGR valve, it monitors EGR flow, it may be misreading the flow, which increases EGR resulting in a too lean fuel mix. To fix, replace DPFE.
Leak @ PCV valve
Leak @ EGR valve
Dirty Mass Air Flow Sensor
Dirty fuel injectors
Low fuel pressure
Vac leak @ intake manifold.
So, sorry there are so many possibilities, but now u have a list. Let me know what u find.

Posted on Nov 20, 2008

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Posted on Jan 02, 2017

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