[IzadorO]

Create a new variable, under your player data enum.

Such as: pInfo[playerid][CarID] - so CarID,

Then link it to the vehicle ID as soon as their vehicle spawns.

Then on top of your motor command, input: if(vehicleid != pInfo[playerid][CarID]) return SendClientMessage(playerid, color, message);

Replace the above with your own code.

For factions, do the same, except detect if it's first a faction vehicle, and then create a car faction variable, and have faction car set to the faction's ID.