The engine C1734 Code is necessary thing and getting the real meaning of the code is necessary thing. The automobile meaning of the code is found online and it is C for Chassis Code Problem is controller area network wiring bus and modules. 1 for MFG – Manufacturer Specific. 7 for Auxiliary Emission Controls. 3 for Cruise Control Servo Indicates Low and 4 for Cruise Vehicle Speed/Set Speed Difference Too High. The lifters are incapable to raise their companion pushrods below the valve rocker arms, so in valves that cannot be activated and remain closed. Do not use false meaning for solving the car engine problem.