Mercedes Tyre Pressure Warning Light
System: Safety System
Component: Tyre Pressure Monitoring System (TPMS)
Typical Symptoms
• Yellow tyre pressure warning light illuminated
• Message: “Check tyre pressure”
• Tyre pressure values missing from display
• Tyre pressure not updating correctly
What the Warning Light Means
A yellow tyre pressure warning light usually indicates:
• one or more tyres have low pressure
This should be checked and corrected as soon as possible.
When Pressure Values Disappear
If the tyre pressure values are not displayed on the screen, this usually indicates:
• faulty tyre pressure sensor
• sensor not communicating with the system
• sensor battery failure
Possible Cause
• low tyre pressure
• faulty TPMS sensor
• sensor battery failure
• incorrect or incompatible sensor installed
Diagnostic Insight
Mercedes TPMS sensors have unique identification codes that must be recognised by the vehicle.
If an aftermarket or incorrect sensor is installed:
• the system may not recognise the sensor
• tyre pressure values may not display
• warning messages may remain active
For this reason, using genuine Mercedes sensors or correct OEM sensors is recommended.
Technicians usually check:
• tyre pressure values in live data
• sensor communication
• correct sensor coding
Important Note
If tyre pressure values are missing, the issue is often sensor-related rather than tyre pressure itself.
Correct sensors must be installed so the system can recognise and communicate with each wheel.
⚠ Professional Diagnostic Recommended
Tyre pressure monitoring systems require correct sensor installation and programming. The vehicle should be inspected by a Mercedes-Benz dealer or qualified Mercedes specialist.
