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2001 Other Hyundai Models Diagnostic Codes

Tiny
DSV511
  • MEMBER
  • 2001 HYUNDAI
Engine Performance problem
2001 Other Hyundai Models

I have a Hyundai XG300 and the check engine light came on so I hooked it up on diagnostic machine. The codes it gave me were PO171 and PO174, is this most-likely a problem with the mass airflow sensor or could it be as simple as a fuel filter or something like that.

Look forward to hearing good news.
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Friday, October 24th, 2008 AT 4:22 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
HI dsv511 and welcome to 2carpros

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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Friday, October 24th, 2008 AT 4:25 PM

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