Fixed Code #1

CMD:engine(playerid, params[])
{
    new vehicleid,engine,lights,alarm,doors,bonnet,boot,objective;
    vehicleid = GetPlayerVehicleID(playerid);
    GetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,bonnet,boot,objective);
    if(!IsPlayerInAnyVehicle(playerid))
        return SendClientMessage(playerid, COLOR_LIGHTRED, "Error: You are not in a vehicle.");
    if(GetPlayerVehicleSeat(playerid) != 0)
        return SendClientMessage(playerid, COLOR_LIGHTRED, "Error: You are not in the drivers seat.");
    if(engine == 1)
    {
        SetVehicleParamsEx(vehicleid,0,lights,alarm,doors,bonnet,boot,objective);
        format(szMessage, sizeof(szMessage), "%s has turned his key in the ignition and turned the engine off!", szPlayerName);
        nearByMessage(playerid, COLOR_PURPLE, szMessage);
    }
    else
    {
        new PlayerName[MAX_PLAYER_NAME];
        SetVehicleParamsEx(vehicleid,1,lights,alarm,doors,bonnet,boot,objective);
        format(szMessage, sizeof(szMessage), "%s has turned his key in the ignition, turning the engine on", szPlayerName);
        nearByMessage(playerid, COLOR_PURPLE, szMessage);
    }
    return 1;
}

CMD:lights(playerid, params[])
{
    new vehicleid,engine,lights,alarm,doors,bonnet,boot,objective;
    vehicleid = GetPlayerVehicleID(playerid);
    GetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,bonnet,boot,objective);
    if(!IsPlayerInAnyVehicle(playerid))
        return SendClientMessage(playerid, COLOR_LIGHTRED, "Error: You are not in a vehicle.");
    if(GetPlayerVehicleSeat(playerid) != 0)
        return SendClientMessage(playerid, COLOR_LIGHTRED, "Error: You are not in the drivers seat.");
    if(lights == 1)
    {
        SetVehicleParamsEx(vehicleid,engine,0,alarm,doors,bonnet,boot,objective);
    }
    else
    {
        SetVehicleParamsEx(vehicleid,engine,1,alarm,doors,bonnet,boot,objective);
    }
    return 1;
}

CMD:hood(playerid, params[])
{
    new vehicleid,engine,lights,alarm,doors,bonnet,boot,objective;
    vehicleid = GetPlayerVehicleID(playerid);
    GetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,bonnet,boot,objective);
    if(!IsPlayerInAnyVehicle(playerid))
        return SendClientMessage(playerid, COLOR_LIGHTRED, "Error: You are not in a vehicle.");
    if(GetPlayerVehicleSeat(playerid) != 0)
        return SendClientMessage(playerid, COLOR_LIGHTRED, "Error: You are not in the drivers seat.");
    if(bonnet == 1)
    {
        SetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,0,boot,objective);
    }
    else
    {
        SetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,1,boot,objective);
    }
    return 1;
}

CMD:trunk(playerid, params[])
{
    new vehicleid,engine,lights,alarm,doors,bonnet,boot,objective;
    vehicleid = GetPlayerVehicleID(playerid);
    GetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,bonnet,boot,objective);
    if(!IsPlayerInAnyVehicle(playerid))
        return SendClientMessage(playerid, COLOR_LIGHTRED, "Error: You are not in a vehicle.");
    if(GetPlayerVehicleSeat(playerid) != 0)
        return SendClientMessage(playerid, COLOR_LIGHTRED, "Error: You are not in the drivers seat.");
    if(boot == 1)
    {
        SetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,bonnet,0,objective);
    }
    else
    {
        SetVehicleParamsEx(vehicleid,engine,lights,alarm,doors,bonnet,1,objective);
    }
    return 1;
}