Solve the car engine problem by the meaning of this car engine P3423 Code. This car engine code is found in many cars and meanings are not same for all car engine problems. Meanings of the car engine code may change by the manufacturer of the car. In the manual of the car engine, you will get the right meaning of the code. You may also use the general meaning of the car engine code when the real meaning of the car engine code is not found. You should look for the real meaning of the code first, if it is not available, then find the general meaning of the code.