The problem of this engine P1907 Code may start from few different factors. You must check the car engine and identify the cause of the car engine problem. Solve the car engine properly and that is why, finding the real problem of the car engine problem is important. The main cause of the car engine problem is coolant and this problem can be fixed easily if you take help from an expert automobile engineer. Do not use wrong meaning of the code what will trigger new problem of the car engine. Solving some problems can be more expensive to solve.