What Causes the Mercedes-Benz Tire Pressure Warning?
2 Answers
Mercedes-Benz tire pressure warning abnormalities generally occur due to the following 3 reasons: Tire pressure abnormality: The warning usually triggers when the pressure is below 1.8bar or exceeds 3.0bar. In such cases, tire inspection and pressure adjustment are necessary. Tire pressure monitoring not reset: After inflating the tires, if the tire pressure is not reset promptly, the tire pressure monitoring system will still record the previous data, causing the tire pressure monitoring indicator to illuminate. Simply performing a tire pressure reset will resolve this issue. Damaged tire pressure sensor: The tire pressure sensor, installed inside the tire and connected to the tire inflation valve, monitors tire pressure. If the sensor is damaged during driving (e.g., by impact), it can also trigger the tire pressure warning light. In case of sensor damage, replacement with a new part is the only solution. According to the international GBT2978-2008 standard, the recommended tire pressure for standard tires is 2.4-2.5bar. In winter, it is advisable to slightly increase the tire pressure by about 0.2bar based on the standard tire pressure. In summer, the tire pressure can generally be about 0.1bar lower than the standard to prevent tire blowouts due to high temperatures.
I've been driving a Mercedes for years, and the tire pressure warning light can be quite annoying when it comes on. The most common reason is low tire pressure, which could be due to a punctured tire from a nail, a slow leak from a loose valve cap, or natural pressure drop from cold weather—especially common in winter. I recommend first finding a safe place to pull over and using a mobile app or an onboard tire pressure gauge to check the actual pressure in each tire. If it's indeed low, just head to a gas station to inflate the tires back to the recommended level. If the light stays on after refilling, it might be a faulty sensor—Mercedes' TPMS system can sometimes have dead batteries, signal interference, or software glitches, requiring a reset with diagnostic tools at an authorized service center. Safety is key: low tire pressure can cause uneven wear, increase fuel consumption, or even lead to loss of control at high speeds. That's why I check my tire pressure monthly to prevent issues—it's always better than dealing with emergencies on the road.
