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A Tyre Pressure Monitoring System (TPMS) is a key safety feature in modern vehicles, designed to alert you when your tyre pressure is too low. Understanding how TPMS works — and what to do when warning lights appear — can help keep you safe on the road and avoid unnecessary wear on your tyres.
This guide explains what TPMS is, how it works, the different types of systems, and how to reset or troubleshoot it.
What Does TPMS Stand For?
TPMS stands for Tyre Pressure Monitoring System.
It is an electronic system that monitors the air pressure inside your tyres and alerts you if it drops below a safe level.
In the UK, TPMS is legally required on all new cars and light commercial vehicles (up to 3.5 tonnes) registered from 1 January 2012 onwards.
How Does a TPMS Work?
A TPMS continuously checks your tyre pressure and warns you — usually via a dashboard light — if one or more tyres become underinflated.
There are two main types of TPMS:
Direct TPMS
Indirect TPMS
Direct systems are more accurate, while indirect systems are simpler and do not require in-tyre sensors.
Why Is TPMS Important for Safety?
TPMS helps reduce the risks associated with underinflated tyres, including:
By alerting you early, TPMS helps prevent accidents and keeps your vehicle operating safely.
Are TPMS Sensors Universal?
No — TPMS sensors are not universal.
Different manufacturers use different sensor types and frequencies, so replacements must be compatible with your specific vehicle.
Do You Need Special Valve Caps for TPMS?
Yes. Vehicles with TPMS use special valve stems and caps designed to work with the sensor.
Using incorrect components can damage the sensor or cause inaccurate readings.
Can You Turn Off TPMS?
It is not recommended to turn off your TPMS.
The system is an important safety feature, and disabling it could increase the risk of driving on underinflated tyres.
In many vehicles, it cannot be permanently disabled without affecting other systems.
How to Reset Tyre Pressure Sensors (TPMS)
If your TPMS light remains on after correcting tyre pressures, you may need to reset the system.
General reset steps:
Steps may vary depending on your vehicle, so always check your owner’s manual.
Where Is the TPMS Reset Button?
The TPMS reset button location varies by vehicle, but is commonly found:
If unsure, refer to your vehicle handbook for exact instructions.
Why Won’t My TPMS Light Turn Off?
If your TPMS warning light stays on, it could indicate:
Always check tyre pressure first before attempting a reset.
If the issue persists, a mechanic can diagnose the system using specialist tools.
How Do TPMS Sensors Get Damaged?
TPMS sensors can become damaged due to:
Damaged sensors may stop transmitting data or trigger warning lights incorrectly.
How to Find a Faulty TPMS Sensor
To identify a faulty sensor, a technician can use:
Because TPMS systems involve electronic components, diagnosis and repair should be carried out by a qualified professional.
Key Things to Know About TPMS
Keeping your TPMS working correctly helps maintain tyre safety, improve efficiency, and reduce the risk of breakdowns or accidents.