Mechanics

CODE P0171/P0174 LEAN CODES

2001 BMW X5

Engine Performance problem
2001 BMW X5 V8 Four Wheel Drive Automatic 112322 miles

WHEN I SCANNED MY THE VEHICLE WITH MY COMPUTER, THOSE CODE APPEAR P0171/P0174 LEAN CODES BUT WHEN I CHECKED FURTHER, THE COMPUTER MENTIONED: (HEATER CATALYST NOT READY, (EGR VALVE NOT SUPPORTED) (A/C REFRIGERATION NOT SUPPORTED)

WHAT IS THAT MEAN BECAUSE I HAVE 4 NEW 02 SENSORS.
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MYSWEETX5
September 25, 2010.




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.

Rasmataz
Sep 26, 2010.


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