Error code P0171 and P0174

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Been having fun and games with engine management light on and I have codes P0171 and P0174. I dont know my way around the engine so if you can identify the areas I need to check and what I need to take off (a description of that part would be useful) so i can try and rectify the problem myself. Tickover is fine and drives perfectly. So I dont understand why I have those codes. On first occasion I cleared the codes and I drove over 50 miles before engine management light came on again. Cant be anything really serious . Book of codes suggest that its running lean on both banks. As a matter of interest which is bank 1 and which is bank 2 as you stand in front of the car. Thank you

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