The B1640 Code is meaningful and you have to solve the problem of the car engine if you want to use the car. The car is not suitable to run with the problem. It seems that the body of the engine has the main problem. You should solve the problem if you have all expertise and machineries. All machineries are expensive. The dictionary meaning of the code helps to get the meaning of the code. However, the engine system, many things activate the B1636 code solenoid valve to regulate oil compression to the engine instrument that is connected in the valve system to change valve timing between high and low. If the engine solenoid valve has an open or not locked.