1999 mazda b2500 or ford ranger

1999 MAZDA B2500
2WD • MANUAL
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GRANTGILDER
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I have a 1999 mazda b2500 with the code po 171 system too lean bank 1 I canged the fuel filter and checked fuel rail pressure it was 39 could it be the fuel pump or fuel pressure regulator or intake gaskets
Jul 29, 2011 at 12:37 AM
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RASMATAZ
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https://www.2carpros.com/articles/repair-lean-mixture-codes-p0171-or-p0174-on-some-manufacturers

Lean fuel condition could be caused by one of the following below:

1.Vacuum leaks
2.EGR and PCV valve.
3.Low fuel pressure.
4.Dirty fuel injectors.
5.Mass Air Flow Sensor.
6.Oxygen Sensor.
Jul 29, 2011 at 12:40 AM