Engine oil level low
Low engine oil pressure
Blocked oil passage
Faulty VCT oil control valve
Engine Light ON (or Service Engine Soon Warning Light)
The VTEC system, in conjunction with the Engine Control Module (ECM), activates the VTEC solenoid valve to control oil pressure to the VTEC mechanism that is installed in the valve system to switch valve timing between Low and High. If the VTEC solenoid valve has an open or short circuit, the P1257 code is set.