The engine U1229 Code is a necessary code and this code has a meaning what you need to use for solving the car engine problem. However, it is suggested to do all of these works by the automobile engineer workshop where all necessary tools are available. You may face terrible problem use of wrong meaning of the code, not using proper tools for solving the car engine problem. Automobile engineers are experts, they know well how to solve the car engine problem. Once the engine is ok, you must take the car for a test drive. Do not try to solve the car in your place if you are unable to solve the car engine problem.