AutoMD ... 12/11/2013
2003 Buick LeSabre Limited 6 Cyl 3.80L
Why does diagnostic say Cylinder 1 is running lean
Check engine light is on
It does not say cyl 1 is lean. It says Bank one is lean, or code P0171 which can have multiple causes. Not a sure thing but I'd say replace the mass air flow sensor. Probability here is greater than 75%.