» » »

Ford Q&A

Ask Your Question

2003 Ford Windstar Question: I have the same code p0174 and also it said, "poor system"

 

Question

Haydee Millayes, 3.8L V6, Reading, PA, July 22, 2012, 09:54
 Rookie

What is that?

1 Answer
Flag This
  • Answer #1

    July 22, 2012, 10:56
    Profile_thumbnail
     Technician

    P0174 (bank 2)indicates that your air/fuel mixture is too lean. There is more air/oxygen than there is fuel.

    Typically lean running conditions can be caused by vacuum leaks, insufficient flow/pressuure from fuel pump, fuel line clogged or leaking, fuel pressure regulator stuck open, fuel filter clogged, fuel injectors clogged, gasoline quality (poor), bad primary oxygen sensor, valve clearances and exhaust leak.

    I would start out with the easiest possible cause: vacuum leaks.

    Reply
    Flag This