The engine P1687 Code is set in all car engines by the car manufacturer as if engineer can find out the faulty area of the car engine if they face trouble in the car engine. The powertrain of the car engine is faulty here and the engine code is letting us know by the engine code. Do not use wrong meaning of the code for solving the car engine. Due to use of the wrong meaning of the code, many car engine has found new or old problem again. That is why, the car owner should solve the car engine problem as soon as possible by an expert engineer.