Przetlumacz sobie
Main reason For P1254 Code
The reason of P1254 OBD-II Engine Trouble Code is Manifold Absolute Pressure/Barometric Pressure Circuit High Input.
P1254 DTC specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set.
Znalazlem cos tutaj http://p1254.enginetroublecode.com/