1999 Other Kia Models Check engine light - Code P0171

Tiny
HLPSCP
  • MEMBER
  • 1999 KIA
  • 4 CYL
  • FWD
  • MANUAL
  • 146,000 MILES
I've had this code checked and now I need to know what will cause this code and how do I fix it.
Thursday, December 20th, 2007 AT 11:23 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
P0171

A lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (Use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (Try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)
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Thursday, December 27th, 2007 AT 2:50 AM

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