I do my best to explain all the possible causes for OBDII codes p0171 and p0174. Telling you what to check for when trying to find the root cause of a Lean condition.&nbsp;
 
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Catalyst System Efficiency Below Threshold P0420 & P0430. Bad Cat? ep 4

Car and Truck maintenance help. Emissions help. OBDII code help. Contact me with your auto issue. 

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