The 2025 model year marked a quiet but significant shift for BYD vehicles sold through XIA’s distribution channels. The automaker moved its TPMS architecture from the older 125kHz LF trigger-based system to a fully OBD-driven sensor ID registration protocol. For shop owners who’ve been manually cycling through magnet-based relearns on earlier BYD models, this is the first major procedural break in nearly four years. And it’s catching some seasoned techs off guard.
The new protocol isn’t harder—it’s just different. And if you’re servicing 2025+ BYD models, you need to know exactly which relearn path your scan tool supports before you start. Here’s what’s changed and how to get through the procedure without burning a diag hour.
Understanding XIA’s Relearn Protocol Shift
On pre-2025 BYD units, the relearn process relied on a stationary magnet procedure. You’d trigger each sensor in sequence—LF, RF, RR, LR—by holding a magnet over the valve stem while the vehicle’s BCM listened for the 433MHz transmission. It worked, but it was slow and required physical access to all four wheels.
The 2025+ architecture uses a different approach. The BCM now expects sensor IDs to be registered via the OBD-II port using a bidirectional scan tool. This isn’t a signal-triggering relearn; it’s a full ID write. The vehicle’s TPMS module stores the new sensor IDs directly, and the sensors themselves don’t need to transmit during the procedure at all. This means you can complete the entire relearn from the driver’s seat, provided your tool supports the BYD-specific protocol.
The catch: not all aftermarket scan tools speak this protocol yet. Many generic OBD tools still default to the old magnet-based method, which will fail on 2025+ vehicles. If you’re using a tool that only handles the stationary procedure, you’ll be stuck with a flashing TPMS light and no way to clear it.
Step-by-Step: OBD Relearn for 2025+ XIA/BYD Vehicles
Before you begin, verify the vehicle model year and confirm you have a tool with BYD TPMS coverage for 2025+. We’ve had good results with Autel’s MX-Sensors 2-in-1 and the launch X-431 series, but any bidirectional scanner with updated BYD software will work.
Step 1: Prepare the vehicle. Park on a flat surface, engage the parking brake, and turn the ignition to the ON position. Do not start the engine. For hybrid or EV models, ensure the high-voltage system is in READY mode but the vehicle isn’t in gear.
Step 2: Connect your scan tool. Plug into the OBD-II port under the dash. Power on the tool and navigate to the TPMS section. Select BYD, then choose the specific model and year. If your tool asks for the vehicle’s VIN, enter it—this ensures the correct sensor protocol loads.
Step 3: Enter relearn mode. Select “Relearn” or “Sensor ID Registration.” The tool will send a command to the TPMS module to enter programming mode. You should see confirmation on both the tool screen and the vehicle’s instrument cluster (usually a TPMS indicator blinking rapidly).
Step 4: Register each sensor ID. The tool will prompt you to enter the sensor IDs. If you’re using pre-programmed sensors like the BL-ST-096 from BH-Sens, the IDs are already set to the correct protocol. You can either manually type the IDs from the sensor labels or, if your tool supports it, scan the sensors wirelessly to auto-populate the fields. Enter IDs in the order: LF, RF, RR, LR.
Step 5: Confirm and exit. Once all four IDs are entered, the tool will send a write command. The TPMS light should stop flashing and remain steady, then turn off after a few seconds. Exit relearn mode and disconnect the tool. Start the vehicle and drive briefly—the system should display correct pressures within 1-2 minutes.
The Stationary Alternative (When You’re Stuck)
If your scan tool doesn’t support the OBD write protocol, you’re not entirely out of options, but you’ll need to be methodical. Some 2025+ BYD units still have a fallback stationary procedure, but it requires a specific sequence: with the vehicle on, press and hold the TPMS reset button (below the steering column) until the horn chirps twice. Then, starting with the LF tire, release air until the horn chirps once. Repeat for RF, RR, LR. This works, but only on certain trim levels—and it’s painfully slow if you’re doing it on a lift.
Common Mistake: Using a diagnostic tool that’s not updated for 2025+ BYD software. The tool will connect, but the TPMS module won’t accept the write command. You’ll see “Command Failed” or the tool will hang. This isn’t a vehicle fault—it’s a tool limitation. Always check for software updates before starting the job.
Sensor Selection and Programming Compatibility
Here’s where the BL-ST-096 earns its keep. This BH-Sens unit (Baolong Technology) is a clamp-in sensor pre-programmed to BYD’s 433MHz format, matching OE part numbers EUEA3609200B and 110964. The pre-programmed nature means you don’t need a tool to clone or copy IDs—the sensor ships ready for the OBD registration process described above.
What matters for the relearn: the sensor’s internal firmware must match BYD’s 2025+ communication timings. Older aftermarket sensors with generic firmware can trigger false activation or fail to respond during the write process. BH-Sens specifically handles these newer BYD protocols, which is why we stock them for 34 different BYD applications.
Key Specs: BL-ST-096
- Brand: BH-Sens (Baolong Technology)
- Frequency: 433MHz
- Type: Clamp-in, pre-programmed
- OE Reference: EUEA3609200B, 110964
- Compatible with: BYD 2025+ models (34 fitments)
- Relearn method: OBD-II write (primary), stationary fallback (limited trims)
Real-World Shop Considerations
For shops servicing BYD vehicles through XIA’s network, the practical takeaway is this: the 2025+ relearn is faster once you have the right tooling, but it demands software currency. If you’re still running a 2023-era scan tool, you’ll need to budget for an update before taking on these jobs. The old magnet-and-air-bleed tricks won’t cut it anymore, and customers won’t appreciate a TPMS light that comes back a day later because the sensor IDs weren’t properly written.
We’ve also seen techs mistake a failed relearn for a faulty sensor—only to discover the scan tool hadn’t been updated for the new BYD protocol. If you’re getting intermittent communication errors during the write process, update your tool first, then reattempt. In most cases, the sensor hardware is fine.
Bottom Line: Pre-Programmed Sensors Streamline the Process
The shift to OBD-based TPMS registration on 2025+ BYD vehicles isn’t a hurdle—it’s an improvement. For shops, it means faster service times and fewer comebacks, as long as you’re working with sensors that match the new protocol. The pre-programmed BL-ST-096 removes the programming variable entirely, letting you focus on the relearn procedure itself.
If you’re adding BYD coverage to your shop’s capabilities, make sure your scan tool software is current and stock sensors that are confirmed for the 2025+ architecture. It’s a small upfront adjustment, but it saves you from the diagnostic headaches that come with mismatched hardware and outdated procedures.
Recommended Part: BL-ST-096 – OE-grade replacement, in stock now.
