The B2452 Code needs explanation for solving the problem. While fuel consumption was increased, hastening was very cooperated, and the loss of engine vacuum led to a unsafe loss of braking assist when the B2452 code system was in 4-cylinder mode. Moreover to these issues, while the company future a hydraulically controlled system that could be swapped from within the car, the version they applied had to be physically changed in the engine compartment using hand tools. Do not drive the car if the car engine problem is not solved. You should use all information and machine for solving the car engine.