The engine P1109 Code seems a powertrain problem of the car engine. This problem should be fixed by the meaning of the code. It seems that you may not fix the car engine problem and you should not allow anyone who has less experience to fix the car engine. The engine should be fixed as soon as possible by an automobile engineer. As the problem of the car engine is not serious problem . it can be fixed early. Without changing any component of the powertrain, the problem of the car engine can be fixed easily. When the car engine is ok, you may drive the car safely.