The engine P1690 Code is very important to ensure the good service from the automobile engineer. The meaning of the car engine code lest you know about the problem and location of the car engine. So, if the right meaning of the code is found, it becomes easier to fix the car engine properly. The right meaning of the code is found from the developer or manufacturer of the car. When the real meaning of the code is unavailable, you may go to the second option like the automobile dictionary meaning what is found from online. It plays important role for solving the car engine.