[CoaPsyFactor]

pawn Код:

new PlayerSpawnedVehicles[MAX_PLAYERS];

public OnPlayerConnect(playerid) {
    PlayerSpawnedVehicles[playerid] = -1;
}

public OnPlayerDisconnect(playerid, reason) {
    if (PlayerSpawnedVehicles[playerid] != -1) {
        DestroyVehicle(PlayerSpawnedVehicles[playerid]);
    }
}

CMD:spawncar(playerid, params[]) {
    if (PlayerSpawnedVehicles[playerid] != -1) {
        DestroyVehicle(PlayerSpawnedVehicles[playerid]);
    }

    // your code

    PlayerSpawnedVehicles[playerid] = CreateVehicle(...);
}