Advice on an A3 1.6

A3Charlie

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Need some help guys... Got a petrol A3 1.6. The 04 model. All original.

Very recently got it and my ECS light came up on my dash. Diagnostics gave me two fault codes - P2626 + P0171.
Now I googled these and both came up as engine running lean and I've noticed sometimes a slight dip in power and a small amount of smoke coming from the exhaust. (Small enough I'm not freaking out but big enough to notice)

Does anyone have a diagnostic for this, what caused this, A solution or had a similar problem? :)