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1999 Mazda B2500 or Ford Ranger

Tiny
GRANTGILDER
  • MEMBER
  • 1999 MAZDA B2500
  • 2WD
  • MANUAL
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
Friday, July 29th, 2011 AT 12:37 AM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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.
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Friday, July 29th, 2011 AT 12:40 AM

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