The B1308 Code has a meaning and this code appears for the fault of the engine. The problem of the router is found on the body engine and it is not necessary to change any part or component from the engine. The valves of all cylinder are remained closed with a pair of arms that switch the conservative engine’s roller-type rocker arm. The B1308 code one of these arms follows the cam profile though the 2nd arm links to the valves. Thru the standard engine process, the 2 arms are combined by a locking pin. You should check the fuel pressure.