Calibration may be necessary if your vehicle is equipped with Advanced Driver Assistance Systems (ADAS) and you’ve had a windshield replacement. These systems rely on sensors that are often located in or near the windshield, and if they are misaligned during replacement, it can affect their performance. Signs that calibration might be needed include warning lights on your dashboard or if you've recently experienced changes in your vehicle's driving behavior. To ensure your safety and the proper functioning of your ADAS features, it’s best to have a professional assess whether calibration is required after any glass replacement.