If this error P3458 Code has come from the car engine after the car engine is tested, it means that you need to look for the meaning of the code to know the problem of the car engine. You can also know the location of the car engine problem from the meaning. For checking the car engine, you have to use some expensive machines and hand tools. If you are not an automobile technician, then you may not have these things and you should not ignore the problem of the car engine. You should take the car to a repair center and let the technician to find the car engine problem.