During the tested of the car engine, the engine code may come on the engine code reader screen. The engine P242B Code is found on the screen for the same reason. Do not drive the car with the car engine problem. Solving the car engine is necessary for driving the car for safely. The engine code is common thing and right meaning of the engine code is found online. If you do not use right meaning of the code for solving the car engine, it may difficult to solve. However, do not use general meaning of the code what may lead to serious problem in the car engine.