What is the difference between Direct and Indirect TPMS?
There are two main types of Tyre Pressure Monitoring System (TPMS): direct TPMS and indirect TPMS. Understanding the difference helps you know how your system works, why your TPMS warning light may come on, and what kind of diagnostics or repair may be needed.
If you are based in London or Essex and your TPMS warning light is on, identifying whether your vehicle uses a direct or indirect system is the first step in diagnosing the issue correctly.
If your TPMS light is already on, you may need TPMS diagnostics or sensor replacement to identify the fault properly.
What is Direct TPMS?
Direct TPMS uses physical sensors fitted inside each wheel to measure tyre pressure in real time. These sensors send data directly to your vehicle, allowing accurate monitoring of each tyre.
Advantages of Direct TPMS
- Provides accurate tyre pressure readings
- Quickly detects pressure loss
- Identifies which specific tyre has the issue
Common Direct TPMS faults
- Sensor battery failure
- Damaged or corroded sensors
- Requires programming after replacement
If you suspect a faulty sensor, read our guide on TPMS sensor replacement.
What is Indirect TPMS?
Indirect TPMS does not use pressure sensors inside the wheels. Instead, it uses the vehicle’s ABS and wheel speed sensors to detect changes in tyre rotation that may indicate low pressure.
Advantages of Indirect TPMS
- No sensors to replace
- Lower maintenance costs
Limitations of Indirect TPMS
- Less accurate than direct TPMS
- Does not show actual tyre pressure
- Requires manual reset after tyre changes
Direct vs Indirect TPMS: Which is better?
Direct TPMS is generally more accurate and is used in most modern vehicles. It provides real-time pressure readings and more precise fault detection.
Indirect TPMS is simpler and cheaper but does not provide the same level of accuracy or detail.
Why is your TPMS warning light on?
A TPMS warning light may come on for several reasons, including low tyre pressure, a faulty TPMS sensor, or a system that needs resetting or programming.
With direct TPMS, the issue is often a failing sensor or battery. With indirect TPMS, the system may simply need recalibrating after tyre pressure changes.
If you’re unsure, you can read our full guide on what TPMS means and how it works.
TPMS diagnostics in London and Essex
If your TPMS warning light stays on, proper diagnostics are essential. Simply resetting the system or inflating tyres may not fix the problem if a sensor has failed.
At Fix My TPMS, we provide TPMS diagnostics, sensor replacement and programming across London and Essex. We identify whether the issue is pressure-related or a system fault so you get the correct fix.
If you need help, view our TPMS services or contact us for expert diagnostics and repair.
Related guides
Frequently asked questions
What is the difference between direct and indirect TPMS?
Direct TPMS uses sensors inside each wheel to measure tyre pressure, while indirect TPMS uses ABS sensors to estimate pressure changes based on wheel speed.
Which TPMS system is more accurate?
Direct TPMS is more accurate because it measures actual tyre pressure in real time. Indirect TPMS estimates pressure changes and is less precise.
Do all cars have direct TPMS?
Most modern vehicles use direct TPMS, but some still use indirect systems depending on manufacturer design.
Why does my TPMS light stay on?
Your TPMS light may stay on due to low tyre pressure, a faulty sensor, or a system that needs resetting or programming.
Can Fix My TPMS diagnose both systems?
Yes. Fix My TPMS provides diagnostics, sensor replacement and programming for both direct and indirect TPMS systems across London and Essex.
Need help with a TPMS warning light?
If your TPMS light is on and you are not sure why, Fix My TPMS can help. We provide professional TPMS diagnostics, sensor replacement and programming across London and Essex, helping you get the correct fix without guesswork.