Definition of the car engine C1918 Code is available from the car manufacturers and you must allow the meaning of the code from your car manufacturer. The automobile meaning of the engine is not helpful but it is available online. The automobile meaning of the code is C for Chassis Code Problem is controller area network wiring bus and modules. 1 for MFG – Manufacturer Specific. 9 for Fuel And Air Metering (Injector Circuit Malfunctions Only). 1 for Low Coolant Circuit and 8 for PCM Stack Overrun. Do not drive the car with the engine problem and by the test drive, the problem of the car engine is checked.