The engine C1709 Code has short explanation and getting correct meaning of the code is necessary to know. The correct meaning of the code is found from the car manufacturer and if you do not follow right meaning of the code, you cannot solve the car engine problem. Other car manufacturer has different meanings of same code but do not follow that meanings. Those meanings are necessary to know and follow. Even you will get the general meaning of the code from online and do not use those meanings. You need to know the correct meaning and you can skip the other meanings.