A TPMS sensor is a battery-powered radio transmitter bolted to a valve stem. It has to match the car’s receiver on frequency and protocol, and it has to physically seat in the wheel. Miss any one of those and you own a small, expensive paperweight. Here’s the order to check things in, whether you’re buying one sensor for your own car or 200 for a shop shelf.
The Four Specs That Decide Fitment
1. Frequency: 433MHz vs 315MHz
Frequency is the first filter. Bestune, FAW and Hongqi vehicles — the FAW group family — predominantly use 433MHz sensors in China-market and most export configurations. Some vehicles built for North American delivery use 315MHz instead.
A 433MHz sensor will not wake a 315MHz receiver. No relearn tool, no scan tool, no amount of driving fixes a frequency mismatch. If you’re unsure, read the number off the old sensor or look the part up by VIN in a dealer catalog. Do not guess from the model name alone.
2. Valve style: clamp-in vs snap-in
Two mounting styles exist, and they are not interchangeable:
- Clamp-in — metal stem secured through the valve hole with a nut and rubber seal. Adjustable, reusable at tire changes with a fresh seal and nut kit, and the better choice for alloy wheels and vehicles that see frequent tire service.
- Snap-in — rubber stem pulled through the hole. Cheaper, but the rubber ages and the whole unit is normally replaced at every tire change.
Check the valve hole and the old sensor’s stem before ordering. If your car came with snap-in sensors, a clamp-in part is the wrong purchase even if everything else matches.
3. Pre-programmed vs configurable (blank) sensors
This is where most buyers lose time.
| Sensor type | How it works | Best for |
|---|---|---|
| Pre-programmed | Protocol and ID format already written for a specific OE application | Shops and owners working on a known platform; no tool investment |
| Configurable / universal | Ships blank or multi-protocol; needs a programming tool to write protocol and ID | General repair shops seeing many makes; requires tool time per install |
Pre-programmed sensors cut install errors and tool costs, but you must stock the correct SKU per platform. Universal sensors reduce SKU count but add a programming step to every job — and a misconfigured sensor is a comeback.
4. OE number and build variation
The same model name can carry different sensors depending on trim, model year and market. The reliable identifier is the OE number stamped or printed on the old sensor, or a VIN-based lookup. Bestune and FAW-group cross-references in this range include **3602100FD, 3602100FDA, 3778080DB01A, 3778080DDS