I did I replace the distributer,spug pluges,wire,cap
My chckengine light cam back on whit the same code p1381
Don't know what to do?? I need mog test too

P1381 is the Crankshaft position(CKP)/top dead center(TDC)/cylinder position(CYP) sensor. What size motor is in your vehicle? The sensor(s) may be servicable separate from the distributor.