Modern cars are fitted with a Tyre Pressure Monitoring System, often called TPMS. This system uses small sensors inside each wheel to keep track of tyre pressure. When everything is working correctly, the car’s dashboard shows the readings or alerts the driver if the pressure drops.
The message “Tyre sensors not detected” appears when the system cannot connect with one or more of these sensors. It does not mean the tyre itself is damaged, but it does mean the car can no longer read the pressure in that wheel. Without this information, the driver is left without an early warning if the tyre loses air or becomes unsafe.
This warning is different from a simple “low tyre pressure” alert. Instead of telling the driver the pressure is low, it means the car cannot communicate with the sensor at all. It is a sign that something needs to be checked before the system can work properly again.
What are Tyre Sensors (TPMS)?
Tyre sensors are small electronic devices that form part of the Tyre Pressure Monitoring System, often shortened to TPMS. Their main job is to track the air pressure in each tyre and send that information to the car’s onboard computer. If the pressure drops below a safe level, the system warns the driver with a light or message on the dashboard.
There are two main types of TPMS
- Direct systems use sensors inside each wheel that measure pressure directly and send exact readings.
- Indirect systems rely on the car’s ABS to monitor wheel speed, which can change when a tyre is underinflated.
Direct systems are more common in newer cars and are also the ones most likely to display the “tyre sensors not detected” message if something goes wrong. By keeping track of tyre pressure, these sensors play a big role in road safety, fuel economy, and reducing wear on tyres.
What Does “Tyre Sensors Not Detected” Message Mean?
When the dashboard shows “tyre sensors not detected,” it is the car’s way of saying it cannot receive a signal from one or more tyre sensors. Each sensor communicates wirelessly with the car’s computer. If that link is broken, the system cannot confirm the pressure in the affected tyre.
It is important to know that this is not the same as a “low tyre pressure” warning. A low-pressure alert tells the driver that the tyre has lost air. A “not detected” message means the car is unable to read the sensor at all. In other words, the problem lies with the communication or the sensor itself rather than with the tyre’s air level.
This warning should not be ignored because it leaves the driver without accurate tyre pressure information. Driving without this data increases the risk of missing an underinflated or damaged tyre.
Common Causes of Tyre Sensors Not Being Detected
There are several reasons why a car might show the “tyre sensors not detected” warning. In most cases, it relates to the sensor itself or the way it communicates with the vehicle. The most common causes include:
- Weak or dead sensor battery: Tyre sensors have built-in batteries that usually last 5 to 10 years. Once they run out, the sensor stops sending signals.
- Damage during tyre replacement: Sensors are small and delicate. They can get cracked or broken if not handled carefully while fitting new tyres.
- Radio Interference: It blocks the signal between the sensor and the car.
- Wiring Issues: Faulty wiring or problems with the receiver inside the vehicle.
- Incompatibility: Using aftermarket wheels or valves that are not compatible with TPMS.
Each of these issues can prevent the system from detecting the sensor, leading to the warning on the dashboard.
Signs and Symptoms to Watch Out For
A car will usually give clear signals when tyre sensors are not working as they should. The most obvious one is the warning message or light on the dashboard. This alert often appears as soon as the car starts or while driving.
Another sign is inconsistent or missing tyre pressure readings. For example, the system may show the pressure of two or three tyres but fail to display one of them. In some cases, the warning may appear on and off, which suggests a weak sensor battery or poor signal connection.
Drivers might also notice changes in handling if the tyre pressure is actually low but the sensor fails to report it. This is why it is important not to rely only on the system but to check tyres manually if the warning shows up
Why You Should not Ignore the Warning Signs?
The “tyre sensors not detected” message might seem like a small fault, but ignoring it can cause bigger problems. Tyre sensors are designed to warn drivers about low pressure before it becomes dangerous. If the system cannot detect the sensors, the driver loses this early warning.
Driving with underinflated tyres increases braking distance, reduces grip in wet weather, and raises the chance of a blowout. It also makes the car use more fuel and causes uneven tyre wear. In the UK and across Europe, working tyre sensors are a legal requirement for vehicles built after 2014. A faulty system can even cause an MOT failure that mat lead to repair costs before the car can pass inspection. Fixing the TPMS sensor issues will keep the car safe, reduces running costs, and avoids problems during safety checks.
How to Fix the “Tyre Sensors Not Detected” Issue?
The good news is that this problem can often be solved without too much trouble. Some fixes are simple enough for drivers to try, while others need professional help.
- Start with the basics. Check the tyre pressures manually using a gauge and inflate them to the correct level.
- In some cars, the TPMS system has a reset option that can be activated through the dashboard settings. Restart the car after adjusting tyre pressures because, it sometimes clears the warning.
- If the message stays, the issue is usually with the sensor itself. A professional technician like AAA mobile Tyres can check for weak batteries, damaged sensors, or faults in the receiver. The technician may replace the single sensor which normally costs less than replacing all of them, but if all the sensores are the same age, changing them together may be more practical.
Note: Most TPMS batteries last between 5 and 10 years before needing replacement.
Prevent Future Sensor Problems
Keeping tyre sensors in good shape saves drivers time, money, and keep you away from extra worries. A few small habits can help reduce the chances of seeing the tyre sensors warning again.
Regular tyre pressure checks are important. Even though sensors track pressure, using a manual gauge every few weeks makes sure readings are accurate. Keep the tyres at the correct level also reduces strain on the sensors. When tyres are changed, it is a good idea to ask the tyre fitter to inspect the sensors for signs of wear or damage. Moisture and dirt can also cause problems. Clean the valve area during washes and avoid harsh chemicals to protect the sensor casing.
Wrapping Up
The “tyre sensors not detected” message can be worrying, but in most cases it has a straightforward cause. It may be linked to low tyre pressure, a weak sensor battery, or signal issues inside the car. Understanding how the TPMS works and knowing the common triggers makes it much easier to deal with the warning quickly.
Simple checks, such as inflating tyres correctly or resetting the system, can sometimes solve the problem, while professional help may be needed for TPMS sensor replacement or receiver faults. Taking small steps to maintain sensors, like cleaning the valve area and testing batteries over time, reduces the risk of repeated alerts.
By paying attention to this system, drivers not only avoid frustrating warnings but also stay safer on the road. After all, well-functioning sensors help keep tyres at the right pressure, improve handling, and extend tyre life.