The engine C1421 Code is easy to find from online and do not access any easy method for the car engine solution. The common mening of the code is found online and do not use the general meaning. The automobile meaning of the code is found from online and you can read it for learning online. If you use this common meaning of the code, you may face terrible problem. The manufacturer of your car has set up a meaning for this code and if you do not follow that real meaning of the code, you cannot easily solve the problem.