When and How Replace Your TPMS Sensors?

Tyre Pressure Monitoring Systems are important vehicle safety systems that notify drivers if tyres are too low in pressure to keep a vehicle from crashing and minimize fuel usage. TPMS sensors also die over time as a result of battery depletion, damage, or sensors failing. However, the knowledge of what happens when replacement is needed is key; understanding the differences between direct and indirect TPMS systems is important. Further, deciding whether to replace a single sensor or all four sensors is also essential for keeping the system accurate and reliable. For increased safety and effectiveness, accurate tyre pressure monitoring is ensured by routine TPMS replacement harrow.

Sensors Replacement in Direct TPMS Systems

The most common type, direct TPMS, utilizes an individual pressure sensor inside each tyre to monitor air pressure and transmit the data to the vehicle's electronic control unit (ECU). Since these are battery-powered sensors, they typically only last between five and ten years before needing replacement. Replacement of a direct TPMS sensor follows a few standard steps should that sensor fail.

The first step is to use a TPMS scan tool to identify the faulty sensor as it reads data from every tyre while detecting the unit that is not functioning. When it is identified, it needs to be deflated and taken out of the wheel to get at the internal sensor. The valve stem is opened by unscrewing or detaching the old sensor. The valve stem incorporates some sensors, meaning that the components must both be replaced.

Once the new sensor is installed, it is important to properly secure the sensor to prevent air leaks or faulty pressure readings. The tyre is reseated into the wheel, seated in the rim and diameter centered, and inflated to the proper PSI. The last step is this: The new sensor is programmed or performed to be relearned so the new sensor can be matched up with the vehicle ECU. The correct method depends on the car manufacturer, but this is all done using a TPMS tool.

Indirect TPMS Systems Reset and Recalibration

Direct TPMS is different from indirect systems as it uses the vehicle's anti-lock braking system (ABS) and wheel speed sensors to determine when the pressure of the vehicle's tyres changes. This system doesn't use physical pressure sensors like with others but instead monitors rotational differences on tyres. When a tyre is underinflated, the diameter goes down; the tyre spins faster than properly inflated tyres, and the TPMS warning light lights up.

Indirect TPMS does not use physical sensors in the tyres which means that they do not have to focus on replacing several components. Consequently, when a warning light appears, the system does not demand sensor replacement but calibration instead. The recalibration process begins with manually checking and adjusting at least one of the tyre pressures for all four tyres to agree with the manufacturer's recommended tyre pressure.

After setting the correct pressure, the TPMS has to be reset. For example, in most cases, the TPMS reset button is often located under the dashboard or inside the vehicle's infotainment system and is generally pressed and held there. In some models, the system must first recalculate by requiring the driving to be done at a steady speed for a specified distance (about 15 to 30 minutes at speeds of ≥25 mph). If recalibration clears the TPMS light, but it comes back on after a while, one should recheck tyre pressure and repeat the reset. Indirect TPMS does not need sensor replacement, but tyres need to be inflated correctly to avoid false alerts.

Comparison between Replacing a Single TPMS Sensor vs. All Four Sensors

For example, if a TPMS sensor fails in a direct system, the owner of a vehicle often wonders whether they should replace just the faulty sensor or all four of them at once. There are numerous factors required, such as system compatibility, cost, and sensor battery life.

In the case that only one sensor has failed and the other three are still functioning, the non-working unit can be replaced. But TPMS sensors have limited battery life, and another sensor may have died, but another or all are also dying to life. In these situations, replacing all four sensors is an easier, cheaper alternative than dealing with subsequent failures that could result in additional labor costs.

The second is whether the TPMS system requires all sensors to be reset or relearned all at the same time. When a new sensor is introduced joint to other sensors, some of the vehicles may experience communication problems and give inconsistent readings. Moreover, replacing all four sensors ensures uniform accuracy since no wheel will have a discrepancy in the measurement of the tyre pressure.

Cost and Long-Term Maintenance Considerations

TPMS sensor replacement cost varies based on the model and make of your vehicle and whether a dealership, tyre shop, or do it yourself replacement. Typically, a single TPMS sensor will run consumers an average of $50 to $150, with an extra $50 to $100 for labor to change each one. Additionally, programming and relearn procedures may be additional for vehicles that require specialty TPMS tools, such as removal and replacement.

Aftermarket TPMS sensors are also a cheaper choice for car owners that are looking to save costs. Aftermarket options can be every bit as reliable, and it is important to check the vehicle's TPMS system is compatible with the new pressure sensors. Before purchasing replacements, it is advisable to check manufacturer recommendations on what kinds of vehicles use what kind of brand and model of manufacturers.