When Should You Replace the Belt Tensioner: Rust bleed and cracks. Pulley bearing wear. Pulley wear. Tensioner assembly misalignment. Tensioner noise. Tensioner arm misalignment. Excessive tensioner arm oscillation. Binding or grinding tensioner arm movement. Loss of spring force. Package Included: 1 * Belt Tensioner (As Shown) Warm Tips: Please check the vehicle compatibility before purchasing to avoid ordering wrong pieces. Any questions, please feel free to contact us, we will try our best to offer better service to you. .