The error P1661 Code is a car engine language. This language lets you know about the problem and if you are an automobile engineer, you will know the process of solving the car engine problem. Do not drive the car if the car engine is not fully ok. Automobile engineer knows well how to fix the car engine and in this case, you must appoint an automobile engineer to solve the car engine problem. The car engine can be fixed by the right meaning of the code and some machines/tools are used. You should also give value of the experience what an automobile has.