The real meaning of the engine code is necessary thing and the automobile engineer needs to know the real meaning of the engine C1866 Code. The C1866 engine code is a kind of chassis problem and this problem is not difficult thing to solve the car engine. Search online to find the automobile meaning of the code. If do not find the real meaning of the engine code, you need to use this general meaning. The engine C1866 code had an sumptuous diagnostics process, with showing the engine problem codes on the air conditioning display. However, the system was problem, misunderstood by customers, and a rash of erratic failures led to the technology being rapidly discharged.