The engine U1186 Code comes when the car engine has any problem. It is necessary to know the real cause of the car engine. That is why, you have to verify the car engine properly. Do not use any meaning of the code. You must allow real meaning of the code and that real meaning of the code is found from the car engine manual and it is provided by the car manufacturer. If you apply wrong meaning of the engine code, you may face terrible problem in the car engine. Do not apply wrong meaning of the code for solving the car engine problem.