You will get the meaning of the B1687 Code if you read the manual of the car. If you do not have the manual, knowing the model number of the car and manufacturer name is enough to solve the problem. There are now 2 chief sorts of cylinder defussion used today, dependent on the kind of engine. The B1687 code for the pushrod style what uses solenoids to change the oil compression brought to the lifters. In their collapsed state, the lifters are unable to elevate their companion pushrods under the valve rocker arms, subsequent in valves that cannot be activated and continue closed.