The meaning of the B2103 Code depends on the manufacturer and brand. Model number is also related with the problem of the engine. While fuel cheap was amplified, hurrying was very compromised, and the loss of engine vacuum led to an unsafe loss of braking assist when the B2103 code system was in four-cylinder mode. In addition to these issues, while the company planned a hydraulically measured system that could be swapped from within the car, the version they realized had to be manually transformed in the engine cubicle using hand tools. Do not try to solve the problem if you cannot identify the real problem of the engine or you do not know how to fix it.