The B2117 Code comes when the car code reader finds problem on the car engine. When the car engine code is checking the area B2117 Code of the engine, then the code appears when the code reader fails to check the area. The code is set on the engine all area by the manufacturer. If you do not know the real meaning of the code what is set by the manufacturer you cannot fix the car engine problem. You need to know many things and have machines if you want to solve the problem. Do not try to fix the problem from the car engine if you do not know how to fix the problem.