What's dose mean p0171 system too lean bank 1

I was put the smoke machine and I made sure no licks on it but still the same thing

I changed all ones checked for air licks and nothing the weird thing it's just bank 1

you can guess at all day long,no telling how much you will spend,guessing!if you have a fat pocketbook,keep guessing or have it scanned with a real scanner,not parts house code reader.one with live data!