ARKit - SceneView Display wrong position 3D Model

I have working on ARKit and it's my beginning. I have added 3D model to display on my ARSCNView. I'm following this tutorial: https://www.appcoda.com/arkit-3d-object/

I'm using same car model which are available in this tutorial. When I add scene node to rootNode. The position of model not proper.

My code as follow:

    @IBOutlet weak var sceneView: ARSCNView!

    func addCar(x: Float = 0, y: Float = 0, z: Float = -0.5) {

        // Safely initialize car.dae scene
        guard let carScene = SCNScene(named: "car.dae") else { return }

        // Initialize a SCNNode object for the car node
        let carNode = SCNNode()
        let carSceneChildNodes = carScene.rootNode.childNodes

        carSceneChildNodes.forEach { carNode.addChildNode($0) }

        carNode.position = SCNVector3(x, y, z)
        carNode.scale = SCNVector3(0.5, 0.5, 0.5)
        sceneView.scene.rootNode.addChildNode(carNode)
    }

I want to display car in proper position as display in following screenshot:

Expected:

Output:

Can anyone explain what is my mistake ?? Help will be appreciate.