Descrizione
A tyre does not fail loudly. It fails while the dashboard stays quiet, which is why the sensor inside the wheel matters more than the light it triggers.
The Signal Guardian is the Autel MX-Series sensor, a two-in-one unit that covers both 315 MHz and 433 MHz, so one part number serves the majority of vehicles on the road instead of a shelf of separate SKUs. It is programmable, which means it is written to the vehicle rather than hoping the vehicle accepts it, and it mounts as a direct replacement on the valve stem with the same seat and torque as the sensor that came off. Autel is the name independent shops and tyre chains already own tooling for, and that matters: a sensor your local garage can program is a sensor that gets fitted on a Saturday instead of ordered and returned.
The motor inside the housing has one job, which is to be accurate at temperature and reliable through rotation. The housing is sealed against the moisture that corrodes cheap stems from the inside, and the battery is rated for the multi-year service interval rather than the season. When it does come time to change, the sensor is relearned in minutes with a scan tool rather than replaced as a sealed assembly at dealer prices.
A pressure reading is only useful if the sensor still has the confidence to report it.
Key Features
- ✦ Dual frequency coverage, 315 MHz and 433 MHz, in one part number
- ✦ Programmable to the vehicle rather than fixed at manufacture
- ✦ Direct valve-stem replacement fitment with the original seat and torque
- ✦ Sealed housing that resists moisture corrosion from inside the wheel
- ✦ Multi-year battery service interval
- ✦ Relearned with a standard TPMS scan tool in minutes
- ✦ Autel ecosystem part, stocked and programmed by independent tyre shops
Technical Specifications
- Type: Programmable TPMS sensor
- Frequencies: 315 MHz and 433 MHz
- Fitment: Direct valve-stem replacement
- Programming: Written to vehicle with TPMS tool
- Housing: Sealed against moisture
- Battery: Multi-year service life
- Valve: Rubber and metal stem options
- Relearn: Standard TPMS scan tool procedure
- Application: Passenger cars and light trucks
- Brand: Autel, MX-Series
Where This Belongs
This is the part a tyre shop keeps a drawer of, and the part a driver buys once the warning light stops being a mystery. It suits the second set of wheels that needs its own sensors for winter tyres, the used set of alloys bought without sensors, the vehicle whose original sensors have reached the end of their battery life, and the shop that would rather program one universal part than stock a dozen vehicle-specific numbers.
Frequently Asked Questions
Q: Does it need to be programmed before fitting?
Yes. The sensor is written to the vehicle with a TPMS scan tool, then fitted and relearned. Programming before mounting avoids doing the job twice.
Q: Will it work on my car?
Coverage spans most passenger cars and light trucks on 315 MHz or 433 MHz systems. Confirm the vehicle frequency and that your tool supports MX-Series programming before ordering.
Q: Can my local garage program it?
Any shop with an Autel-compatible TPMS tool can. That is the practical reason to buy this sensor rather than a dealer-only part.
Q: How long does the battery last?
The battery is rated for a multi-year service interval under normal use. Driving time and how often the vehicle is stationary for long periods both affect it.
Q: Do I need to replace all four at once?
Not always, but sensors fitted at the same time tend to reach end of life together. If one has failed on a set of the same age, expect the others to follow.
Q: Is a valve stem included?
The sensor mounts as a valve-stem replacement, with stem options to match the wheel. Choose the stem type that matches the wheel before fitting.
Q: Do I need to replace the valve nut and seal as well?
Yes. A new sensor should go in with a fresh seal and nut, because a reused seal is a slow leak waiting to happen. Most fitting kits include them, and a tyre shop will have them on the shelf.
Q: How soon will the warning light clear?
Once the sensor is programmed, fitted and relearned, the vehicle should accept it on the next drive cycle. Some vehicles clear immediately, others after a short period above a set speed.





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