2004 Suzuki Verona CHECK ENGINE LIGHT STAYING ON

Tiny
JBCAMPR
  • MEMBER
  • 2004 SUZUKI VERONA
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 65,000 MILES
I have check the trouble codes and they are. P0171 and P0174. System to lean bank 1&2. What is causing it to be to lean?
Wednesday, March 4th, 2009 AT 8:25 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
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, March 5th, 2009 AT 1:19 AM

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