Why does the tire pressure light come on after replacing the battery in a Volkswagen?

[VonRhett]

Volkswagen tire pressure light comes on after replacing the battery for the following reasons: Abnormal tire pressure: Generally, it will trigger an alarm if the pressure is below 1.8 bar or above 3.0 bar. In this case, tire inspection and pressure adjustment are required. Tire pressure monitoring not reset: After inflating the tires, if the tire pressure is not reset in time, the tire pressure monitoring system will still record the previous data, causing the tire pressure monitoring light to illuminate. Simply performing a tire pressure reset will resolve this issue. Damaged tire pressure sensor: The tire pressure sensor, which monitors tire pressure, is installed inside the tire and connected to the tire inflation valve. If the sensor is damaged due to impact while driving, it can also cause the tire pressure warning light to come on. In case of sensor damage, the only solution is to replace it with a new part. The tire pressure monitoring indicator is a yellow symbol—an irregular circle without a seal on top, with four small spikes at the bottom and an exclamation mark inside. The illumination of this light indicates abnormal tire pressure.