The real meaning of the car engine code lets us know about the real problem. The car engine P2157 Code has different problems. Among all of the meanings of the code, the right and the automobile dictionary meaning of the code is acceptable for solving the car engine problem. The real meaning of the code is found from the automobile manufacturer and the real meaning of the code is found from general source. The general meaning of the code may not match or suitable with the real problem of the car engine problem. The car engine problem can be serious and expensive problem.