The engine P1492 Code is found when the car engine is tested. You need to know the meaning of the code for solving the car engine. You must depend on the real meaning of the code for solving the car engine. The engine system, in conjunction with the engine control module (ECM) or powertrain control module (PCM), triggers the engine P1492 code solenoid valve to switch oil compression to the engine mechanism that is installed in the valve system to change valve timing between Low and High. If the engine solenoid valve has an open or short circuit, a DTC is stored.