Hello 1524146885, thanks for your question in the Community and sorry for my late answer.
This fault Code means the following: Fuel Trim Bank 1
It could be some faults:
Pressure regulating valve works not right, this would be controlled with under pressure. Means if your throttle is closed in the stand, the under pressure is high an the valve stands open, at half throttle or full throttle the pressure is lower and the valve could closer and closer.
The second fault could be an open Injektion valve.
The third fault could be a Electric fault from the ECU
So Check the wiring and hose from the valve and injection.
Next Check is the driving from the injection valves. You can check this timing with a led at the contact on the injection valves.