The engine P0087 Code is necessary to know and if the car engine is not found, do not try to fix the car engine. The engine P0087code has different meanings. The engine P0087 is a universal OBD2 diagnostic trouble code that specifies a fault within the fuel transfer system. This code is set after the ECM has detected low fuel compression at the fuel compression sensor. The are many reasons to start the engine code and those are the most common cause is a clogged fuel screen or filter, a restricted fuel line, A failing fuel pump and Improperly reading fuel compression sensor will set P0087 etc.