1994 Ford Thunderbird System Too Lean

FORD THUNDERBIRD
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VZE2DDHK
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  • 1 POST
: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 7:36 AM
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LOSONE
  • ✓Experienced Mechanic
  • 1,616 POSTS
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 7:58 AM
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Suggested Repair

Check the mass airflow (MAF) sensor, oxygen sensors, and MAP sensor, since a fault in any of them can set lean codes on both banks.

Conversation Summary

The owner of a 1994 Ford Thunderbird with a 4.6 engine and about 75,000 miles reports P0171 and P0174 codes indicating the system is too lean on banks 1 and 2. The expert says a faulty Ford MAF sensor, a bad oxygen sensor, or a MAP sensor that is not working correctly can cause these lean codes.

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