The error B1206 Code is found from the faulty vehicle engine. It is difficult to identify the problem if the model number and manufacture of the car is unknown. The manual of the car and engine may necessary to use for solving the problem of code B1206. This diagnosis code may also be activated by faults earlier down the line. While fuel economy was amplified, acceleration was seriously conceded, and the loss of engine vacuum led to a hazardous loss of braking support when the B1206 code system was in four-cylinder mode. The meaning of error B1206 Code is body code for B, MFG for 1, BBV for 1, Low Coolant Circuit for 0 and Transmission for 6.