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Re: 2001 Ford E-250 Lean Codes 5.4L
Posted to Technical Discussion Forum on 9/13/2011 2 Replies

PERFORM DIAGNOSRTIC TEST FOR LEAN CODES P0171-P0174. NOTE: BARO READING WILL NOT INCREASE OVER 140HZ PERFERRED RANGE FOR THIS ALTITUDE 153-157HZ.

SMOKE CHECK INTAKE SYSTEM FOR LEAKS, DEFECTIVE PCV VALVE, MONITOR 02 SENSOR FUNCTION. SENSOR ARE SLOW DO TO AGE ... Login to read more.

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