Buick P0171 Code After Fuel Pump and Filter Replacement
My daughter recently had her Buick's fuel pump, relay, and fuel filter replaced just five days ago. Today, the check engine light came on and displayed code P0171 — indicating a lean system in Bank 1. I'm wondering if there's a connection between the recent repairs and this issue. Could it be that the fuel pump or filter wasn't properly reinstalled during the replacement? Any insights would be greatly appreciated.
Running out of fuel could trigger the P0171 code — so when exactly did the check engine light appear? It might also be worth checking for low fuel pump pressure, as this is a common cause. A vacuum leak should also be ruled out as a potential contributing factor.