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#1
12-07-2008, 12:48 PM
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System too Lean
I have a 2000 dodge dakota. The check engine light is on and the code it gives me is P0171 - system too lean (left cylinder bank). Does anyone have any idea where I can start to try to narrow this down to the problem??
Last edited by dodgefamily2008; 12-08-2008 at 05:19 PM. 
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#2
12-07-2008, 01:14 PM
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Re: System too Lean
#1 cause of po 171 is a vacuum leak so check around. that being said that is not the only cause of po171. mike
__________________
2006 liberty 3.7 6speed manual 1999 cherokee classic 4.0L 1991 wrangler yj 2.5L 2001 caravan 3.3 auto 1995&1992&1994 camry 2.2L SOLD 1991 silverado 1500 SOLD 2000 rodeo SOLD 
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#3
12-07-2008, 01:52 PM
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Re: System too Lean
Thank you I will definitely start there.
I apologize I forgot to mention that there is also a black soot coming from the tailpipe. The truck has an awful smell.
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#4
12-08-2008, 05:18 PM
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Re: System too Lean
I have the problem narrowed down to the O2 sensor. Does anyone know how to test the sensor in order to determine if it is upstream or downstream?
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