You should drive the car engine when you find problem in the tire or in the car engine. Check the car engine in your place if possible or take the car to automobile engineer for solving the car engine. You will get an engine code like P1794 Code and it has a meaning what you need to know. The automobile dictionary meaning of the code is also found online and it is p for Powertrain Code Problem is related engine, transmission and emissions systems. 1 for MFG – Manufacturer Specific. 7 for Auxiliary Emission Controls. 9 for Crankshaft Position Sensor Circuit Performance and 4 for Cruise Vehicle Speed/Set Speed Difference Too High.