Will a TPMS Warning Light Fail an MOT?
This is one of the most common questions drivers ask when they see the tyre pressure warning light appear shortly before their MOT.
In the UK, vehicles registered after January 2012 that are fitted with TPMS must have a fully functioning system during the MOT test.
If the TPMS warning light is showing on the dashboard due to a system fault, the vehicle will normally fail the MOT.
This means that if a sensor battery has died or the system cannot detect tyre pressure correctly, it must be repaired before the car can pass its MOT.
However, if the warning light appears simply because one of the tyres is underinflated, inflating the tyre to the correct pressure will usually clear the warning light. If the light switches off and the system is working normally, the vehicle can pass its MOT.
Vehicles registered before 2012 generally do not have TPMS included in MOT requirements.
Modern vehicles are packed with safety systems designed to alert drivers when something is not quite right. One of the most common warning lights drivers see today is the tyre pressure monitoring system (TPMS) light. If this warning appears on your dashboard, it usually means your vehicle has detected a problem with tyre pressure or with the tyre sensors themselves.
If you need to fit tyre sensors in Brentwood, understanding how the system works and how it affects your MOT can save you time, money, and unnecessary stress.
What Are Tyre Pressure Monitoring Sensors?
Tyre Pressure Monitoring System sensors are small electronic devices located inside each wheel, usually attached to the tyre valve. Their job is to measure the air pressure inside your tyres and send that information to the car’s computer system.
If the pressure drops below a safe level, the system triggers a dashboard warning light to alert the driver.
This technology helps prevent several problems including:
- Driving with dangerously low tyre pressure
- Reduced fuel efficiency
- Uneven tyre wear
- Potential tyre blowouts
Because tyres are the only part of the car touching the road, maintaining correct pressure is critical for safety and vehicle performance.
Why Tyre Sensor Warning Lights Appear
The most obvious reason a TPMS light appears is simply low tyre pressure. A drop in temperature can cause air pressure to fall slightly, which sometimes triggers the warning light during colder weather.
However, many drivers discover the warning light stays on even after inflating the tyres. When this happens, the problem is often with the tyre pressure sensor itself.
Common causes include:
- Sensor battery failure
- Damaged sensors during tyre changes
- Faulty valve units
- Lost communication between the sensor and the car
The internal batteries in tyre sensors typically last between five and seven years. After that time, they gradually stop transmitting data to the vehicle.
How Long Do Tyre Sensors Last?
Many vehicle owners are surprised when tyre sensors begin failing around the five-year mark. This is actually very common across many car manufacturers.
The sensor batteries are sealed units and cannot be replaced individually. When the battery fails, the entire sensor needs replacing.
Some drivers notice that sensors fail one at a time over several months. Others find multiple sensors failing around the same time, especially if the vehicle is around five or six years old.
When this happens, it is usually best to replace the faulty sensors rather than constantly resetting warning lights.
Why Drivers in Brentwood Often Need Sensor Replacement
In areas like Brentwood, many vehicles now fall within the age range where TPMS batteries naturally begin to fail. Cars produced between 2015 and 2020 are particularly reaching the point where original sensors are wearing out.
Drivers often notice the warning light appearing after:
- Replacing tyres
- Changing wheels
- Seasonal temperature changes
- Normal battery aging
If the warning light stays on permanently, the most reliable solution is to replace the faulty sensor.
Professional Tyre Sensor Installation
Fitting new tyre pressure sensors requires specialist equipment to ensure the system communicates correctly with the vehicle.
During installation, the garage will:
- Remove the tyre from the wheel
- Install a new TPMS sensor and valve
- Rebalance the wheel
- Program the sensor to communicate with the vehicle
Once installed and programmed correctly, the warning light should disappear and the TPMS system will resume monitoring tyre pressure normally.
Why Correct Tyre Pressure Matters
Tyres that are even slightly underinflated can cause a surprising number of problems. Research has shown that driving with tyres only a few PSI below the recommended level can increase tyre wear significantly.
Low tyre pressure can also reduce fuel efficiency because the engine has to work harder to move the vehicle.
More importantly, incorrect tyre pressure reduces grip and stability, especially during braking or cornering.
This is why modern vehicles rely on TPMS technology to constantly monitor tyre pressure and warn drivers before problems become serious.
Fit Tyre Sensors in Brentwood
If your tyre pressure warning light remains on, or if your sensors have stopped working, professional replacement is usually the best solution.
At The Garage Brentwood we can diagnose TPMS faults and fit tyre sensors in Brentwood quickly and correctly so your vehicle stays safe and ready for its MOT.
Our technicians can identify faulty sensors, install replacements, and ensure the system is programmed properly for your vehicle.
If you have noticed a TPMS warning light or suspect your tyre sensors may have failed, it is best to get the system checked before it affects your MOT.
For expert help and advice, please contact us today.