help with codes

pdzcallday

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Joined
Jun 7, 2005
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lake worth
my car has not been running right for a little wile now. i have replaced alot of diffent parts because my car has not throwen a check eng light yet, till now. it has throwen a coad and the coad is p0171 and p0174. any ideas as to what these are. could it be a bad o2 sensor? it says "system to lean" for both the codes. any help would be great.
by the way the car is a 2000 with about 104,000 miles on it. it's a v6 3.0l
 

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