The manufacturer of the car engine set a meaning of the P0042 Code and it is called real meaning of the car engine code. The real meaning of the code is linked with the brand and car model. Do not drive the car with the faulty car engine. Once your car engine is fixed, you must take the car for a test. Read the manual of the car to know the real meaning of the car engine. Solving the network of the car engine is necessary to solve. Do not use the automobile meaning for solving the car engine problem and it may create more problem.