You need to know the meaning of the engine C1797 Code. If the right meaning of the engine code is found, do not try to fix the car engine. The right meaning of the engine code is found from the car manufacturer. Read the car engine manual for finding the exact meaning of the engine code. Do not drive the car until you can solve the car engine problem. As the code has come on the screen of the code reader and the code has started with the alphabet C, it means that chassis of the car engine has the problem. Fixing the car engine of chassis problem is easy to fix.