Fix the car engine by a car engine technician and know the problem of the car engine. If the car engine problem stays for longer, it may be a serious issue for the car. The car engine P3138 Code contains some information and if those information can be found, it is easy to detect the problem and take action for solving the car engine problem. You may use general meaning of the code for solving the car engine. If you know the real meaning of the code, you do not need to use general meaning of the code for solving the car engine.