system too lean

FORD THUNDERBIRD
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VZE2DDHK
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:D I have a 1994 t-bird ls with a 4.6 engine and approx. 75k miles. I keep getting codes P0171,P0174 Mod $10 banks 1&2. Tells me that system is too lean. Can you tell me what my trouble may be.
Thank you
May 8, 2006 at 2:36 PM
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LOSONE
  • ✓ASE Certified Mechanic
  • 1,616 POSTS
  • ASE Certified Mechanic
A Ford Mass Air Flow sensor can set a lean code also a bad O2 sensor can do the same thing. If the MAP sensor is not working right it can cause the same thing.
May 8, 2006 at 2:58 PM
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