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Hello all, I have an 04 V8. Just took it in last week to the dealer to have the oil done. The vehicle was inspected and it was given a clean bill of health. Today the check engine light came on and I pulled the codes and they are P0171 & P0174 (Bank 1 & 2 to lean). Doesn't seem to be doing anything odd or out of the ordinary but just wondering what this might be? Or if the dealer might have done something in the process of changing the oil?
 

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Those codes can be triggered by multiple causes like vacuum leak, MAF, fuel pumps and PCV valve, you need to narrow the problem down by checking them one by one, i would start with vacuum as its most common, kind regards, Nikoloz
 
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