Tyre pressure sensor guide – all about TPMS sensors
The safety of your vehicle depends on many factors – one of the most underestimated is the correct tyre pressure. Modern vehicles therefore rely on a tyre pressure monitoring system (TPMS), known internationally as TPMS (Tire Pressure Monitoring System). Since the legal requirement for new vehicles from November 2014, these small but essential sensors have come into focus for every driver. In this comprehensive guide you will learn all about how they work, maintenance, costs and the professional replacement of tyre pressure sensors – with technical depth and direct practical relevance.
Quick answers
Which tire pressure sensor fits my car?
Which tire pressure sensor fits depends on make, model and year of manufacture, more precisely on the HSN and TSN from the vehicle registration certificate part I (German vehicle-registration codes in fields 2.1 and 2.2). This information is found in fields 2.1 and 2.2. Alternatively, the OE comparison number of the old sensor can be used. With this number, the result can be matched on the product page. The sensor must match the frequency, the radio protocol and the valve type of the vehicle so that it is recognized like an original sensor.
Do new TPMS sensors need to be learned?
Usually yes, but the procedure depends on the manufacturer. Some vehicles detect new sensors during a drive, others via the vehicle menu, and others only with a TPMS diagnostic tool. With a direct system, each wheel needs a sensor, including the winter wheels, otherwise the vehicle reports a fault. With an indirect system, there are no sensors in the wheel.
What frequency do tire pressure sensors use?
In Europe, tire pressure sensors operate at 433 MHz. Vehicles for other markets such as North America sometimes use a different frequency. Such sensors are not interchangeable. The tire pressure sensors at Electronicx operate at 433 MHz.
Updated: 08.10.2026
What is a tyre pressure sensor and how does it work?
A tyre pressure sensor is an electronic component that is mounted either on the valve base or on the wheel rim flange and measures the air pressure and usually the temperature inside the tyre. It transmits this data by radio to the vehicle's control unit. Modern systems work with an accuracy of ±0.1 bar and thus allow precise monitoring of each individual wheel.
Direct vs. indirect TPMS
| Criterion | Direct system | Indirect system |
|---|---|---|
| Measuring principle | Air pressure directly via a sensor in the wheel (0–6.5 bar measuring range) | Speed comparison via ABS sensors, no pressure sensor |
| Accuracy | ±0.1 bar, shows exact pressure and temperature | No absolute pressure value, only relative deviation |
| Sensor in the wheel rim | Yes, replaces the valve or sits on the wheel rim flange | No, no additional hardware |
| Detection of wheel change | Automatic (on many models via localisation antenna) | Manual reset required |
| Cost per wheel | depending on sensor and vehicle | No sensor costs |
| Maintenance interval | Sensor battery typically lasts 5–10 years, then complete replacement | No maintenance, only initialisation after tyre change |
Most vehicles from model year 2014 onwards use direct systems, as they work more reliably and comply with the legal requirements of EU Regulation ECE-R 64.
Vehicles with mandatory TPMS – legal basis
Since 1 November 2014, all newly type-approved passenger cars and motorhomes in the EU must be equipped with a functioning tyre pressure monitoring system. For all vehicles first registered from this date onwards, the requirement also applies progressively. In concrete terms this means: if a sensor fails, the warning light stays on and the system no longer warns of pressure loss. A defective sensor should therefore be replaced.
This affects almost all common models from Audi, BMW, Ford, Mercedes-Benz, Volkswagen and many other manufacturers. A functioning TPMS is therefore not only a question of safety, but also of vehicle registration.
Technical details and compatibility of TPMS sensors
Anyone who has to replace a defective tyre pressure sensor often faces the question of compatibility. Not every sensor fits every car – there are decisive technical differences.
Frequencies and protocols
In Europe, TPMS sensors usually work on the frequency 433 MHz; vehicles for other markets may use a different frequency. There are also manufacturer-specific protocols: even if two sensors transmit on 433 MHz, they may be coded for different vehicle makes. It is therefore crucial that the sensor is designed for the vehicle: the same frequency, a suitable protocol and a suitable valve shape.
Different designs and valve variants
Tyre pressure sensors also differ mechanically: while some are bolted directly to an aluminium or rubber valve and remain accessible from the outside, others are fitted as a completely integrated unit inside the rim. Particularly with alloy wheels, the valve material is decisive – an aluminium valve with corrosion protection prevents galvanic reactions with the rim material. High-quality sensors also provide a temperature measuring range of -40 °C to +125 °C, which ensures precise data both on extremely cold winter days and under heavy braking load. The internal lithium button cell (typically 3 V/500 mAh) typically lasts 5–10 years, depending on the driving profile and transmission interval.
For the exact compatibility of your vehicle, you will find suitable sensors in our shop under tyre pressure sensors for Audi, for BMW and many other brands. A look at the vehicle registration document (key number) or use of our selection tool helps to identify the right sensor.
Signs of defective or weak TPMS sensors
A failing tyre pressure sensor usually announces itself through typical symptoms before it finally fails. Look out for the following warning signs:
- TPMS warning light stays on permanently or flashes when the vehicle is started
- Error message “Check tyre pressure” despite correct air filling (measured with an external pressure gauge)
- Missing pressure display for individual wheels in the instrument cluster (if individual wheel display is available)
- Visible damage to the sensor valve: corrosion, cracks or a loose valve top
- Strongly fluctuating pressure values that do not match the ambient temperature (e.g. 0.5 bar jumps without reason)
- Sensor is reported as “not recognised” or “battery weak” when read out with a diagnostic device
The message of a weak battery in particular should be taken seriously: a complete sensor failure leads to the TPMS warning light coming on.
Replacing a TPMS sensor: step-by-step instructions
Replacing a defective tyre pressure sensor requires mechanical skill and the right tools. In principle, the replacement can be carried out yourself or in a specialist workshop.
Workshop or DIY fitting?
For DIY fitting you need a trolley jack, torque wrench, tyre levers as well as a programming and triggering device (cost between 50 and 200 €). In addition, the tyre must be pressed down on the side of the valve in order to release the old sensor and insert the new one. The risk of damaging the rim or the tyre should not be underestimated without a professional fitting machine. If you are unsure, have the replacement carried out by a tyre service – as a rule, this incurs 15–30 € per wheel in pure fitting costs, plus the sensor price.
Programming and relearning (relearn)
After the physical installation, the new sensor must be recognised by the vehicle. There are several procedures for this:
- Automatic relearn: Many models recognise the new sensors automatically after a short drive (e.g. many VW, Audi, Skoda).
- Stationary relearning via diagnostic device: With BMW and Mercedes, the control unit must be rewritten with the sensor IDs via the OBD interface.
- Manual triggering with a trigger tool: Each sensor is activated one after the other and the vehicle assigns the ID to the respective wheel via the pressure drop in the system or via a localisation function.
In our range of TPMS sensors you will find suitable sensors by vehicle or HSN/TSN.
Costs for TPMS sensors and installation
The total costs for a sensor replacement consist of material and labour. An OEM sensor costs between 60 and 150 € per piece depending on the brand. For a complete axle (2 wheels) you should therefore reckon with 120–300 € in material costs, and for all four wheels with 240–600 €. In addition, there is 15–30 € per wheel for removal, fitting and balancing. If all four sensors are replaced, the total costs including installation are often between 350 and 700 €.
You can save money by purchasing the sensor online in advance – make sure the vehicle assignment is correct and the applicable frequencies (433 MHz in Europe). In the TPMS assistant you will find sensors by vehicle or HSN/TSN.
Frequently asked questions about TPMS
What is the difference between active and passive TPMS?
The term "active" is sometimes used for the direct system, as it actively measures and transmits the pressure; "passive", on the other hand, for the indirect system, which works without a sensor. In technical language, however, the correct terms are direct and indirect TPMS. Direct systems measure actual values, indirect systems compare wheel speeds and detect a pressure loss only on the basis of the changed rolling circumference.
Do TPMS sensors have to be replaced at every tyre change?
No. A tyre pressure sensor is a separate component that does not automatically have to be replaced with the tyre. As long as the sensor is intact and its battery still supplies sufficient voltage (typically 5–10 years), it can continue to be used during a tyre change. However, it is advisable to renew the valve core and the seal at every tyre fitting – a service kit costs only a few euros and prevents leaks.
Can I replace a defective tyre pressure sensor myself?
Yes, with the appropriate equipment and expertise. You need tyre fitting tools, a torque wrench and a trigger/programming device. The biggest hurdle is pressing the tyre off the rim flange correctly without damaging the tyre or rim. In addition, depending on the vehicle, the sensor must be learned in, which can be difficult without diagnostic knowledge. Many motorists therefore opt for fitting in a specialist workshop in order to avoid mistakes.
How much does replacing a TPMS sensor cost?
Per wheel, you should expect 80–250 €, depending on the sensor, vehicle and learning effort. A single sensor replacement (including fitting and balancing) usually comes to 100–180 €. A set of four sensors can cost between 350 and 700 €. You can find exact prices in our online shop under the vehicle-specific categories.
What service life does a TPMS sensor have?
The typical service life of a direct TPMS sensor is typically 5–10 years. The decisive factors are the quality of the lithium battery installed and the number of radio transmissions (at high speed the sensor transmits more frequently). Extreme temperature fluctuations and long periods of standing at low temperatures can also reduce battery capacity.
How are new TPMS sensors learned in?
The procedure depends on the manufacturer: some vehicles detect new sensors during a drive, others via the vehicle menu, and others only with a TPMS diagnostic device.
What does the tyre pressure warning light with a flashing symbol mean?
A flashing TPMS light when the ignition is switched on indicates a system fault, not necessarily a loss of pressure. Often a sensor is defective (battery empty, radio failure) or the control unit does not recognise the sensor ID. In this case, a diagnostic device helps to read out the exact fault memory. Usually the affected sensor must be replaced.
Are TPMS sensors specific to my vehicle model?
Yes, compatibility depends on the frequency (433 MHz in Europe), the protocol and the installation position on the valve. Within a group (e.g. VW Group), sensors are often identical in design but may have different part numbers. What matters is that the sensor is designed for the vehicle. Use the vehicle selection in our shop – it ensures you get the right sensor, right down to the chassis number.
Conclusion and recommendation – servicing TPMS sensors and replacing them in good time
The tyre pressure monitoring system is an active safety aid whose failure should not be underestimated. A functioning TPMS demonstrably reduces the risk of accidents caused by tyre pressure that is too low and saves fuel (up to 0.3 l/100 km at optimum pressure). Because every sensor has a limited battery life, we recommend renewing the sensors preventively after 7 years at the latest – especially if a set of tyres is being fitted anyway. If there are signs of a weak battery or if the warning light is active despite correct tyre pressure, do not delay replacement. The investment in high-quality sensors pays off twice over: for your safety and for maintaining the vehicle's value.
At Electronicx you can find TPMS sensors by vehicle, brand or HSN/TSN. If you have questions about compatibility or fitting, you can reach us by telephone on +49 7135 7194106 or by email at [email protected]. We ship free of charge within Germany via DHL.
Short answers to the most common questions: TPMS & TPMS FAQ · TPMS sensors for winter wheels · TPMS warning light after a tyre change.
Operator of this site: Electronicx GmbH, Hindenburgstr. 37A, 74389 Cleebronn, Germany. Managing Director: Andreas Emschanow. VAT ID: DE300176428, HRB 752730 Amtsgericht Stuttgart. Tel.: +49 7135 7194106, email: [email protected]
Further information on starter batteries and your vehicle's power supply can be found in our 12-volt battery guide. There we explain everything worth knowing about AGM, EFB and lithium vehicle batteries.