You will not get the B1756 Code from the car. The code appears when the car is checked and the code may come up. You should drive the car with the problem and you have to solve the problem as soon as possible. The dictionary meanings of the code for the cars are different. So, it is necessary to know the details of the car like manufacturer name and model number. The regulation of B1756 engine code when it derives to emissions-related car repair is that any change that changes the car from a certified shape to a non-certified formation is measured tampering.