Relearn vs. Programming — Know Which Job You’re Doing
These two words get used interchangeably, and that’s why people waste an afternoon.
- Programming writes data into the sensor — protocol, frequency, sometimes the ID.
- Relearn writes data into the vehicle — it tells the BCM/ECU which sensor ID belongs to which corner of the car.
If you’re installing a pre-programmed sensor, the programming step is already done at the factory. You only need a relearn. That’s the case with a 433 MHz clamp-in unit like BL-ST-036 | BH-Sens 433MHz TPMS Tire Pressure Sensor | Fits Geely | OE# 01725271 — it arrives loaded with the correct protocol for Geely-based applications, so you can skip the bench programming station entirely.
The mistake to avoid: buying a blank/universal sensor and expecting your car to figure it out. It won’t.
Tools You Actually Need
| Task | Tool | Notes |
|---|---|---|
| Read/clear TPMS codes | OBD-II TPMS scan tool | Any modern TPMS-capable unit |
| Trigger sensors at each wheel | 433 MHz-capable activation tool | ATEQ, Autel, Bartec and similar |
| Write IDs to the ECU | Scan tool with OBD relearn function | Required for the OBD method |
| Tire work | Tire changer + balancer | Clamp-in stems need a new grommet and nut |
| Basics | Accurate gauge, torque wrench | For stem nut torque, follow your service manual |
A magnet will not trigger a 433 MHz sensor. Don’t waste time trying.
Method 1: Auto Relearn (Drive Cycle) — Start Here
This costs nothing and works on most ATLAS vehicles when the sensor is already programmed and installed in the correct position.
- Set all four tires to the pressure on the driver’s door jamb placard. Do this cold.
- Turn the ignition on (engine running is fine).
- Drive above roughly 25 mph / 40 km/h for 10–20 minutes. Steady highway driving works better than stop-and-go.
- Watch the warning light or message. It should clear on its own.
- If it doesn’t, park, key off for a minute, and repeat the drive once. Some models need two full cycles.
If nothing happens after two attempts, the vehicle isn’t auto-learning — move to a triggered method.
Method 2: Stationary Relearn (Activation Tool)
This is the standard shop procedure when the ECU needs to be told the sensor IDs.
- Park, set pressures, key on — engine off.
- Put the vehicle into learn mode. Depending on the model, that’s a menu path in the dash cluster, a button under the dash, or a function inside your OBD scan tool. Check your owner’s manual for the exact entry.
- Start at the left front. Hold the activation tool against the sidewall right next to the valve stem and press trigger. A horn chirp, flash, or on-screen confirmation means the ID was accepted.
- Move to right front, then right rear, then left rear — or follow whatever order the tool displays. Order matters on many systems.
- Exit learn mode, key off, then drive a few minutes to verify the light stays off.
Takes 5–10 minutes once you know the learn-mode entry.
Method 3: OBD-II Relearn (Hard Write)
Use this when auto and stationary relearns fail, after a tire rotation, or if the BCM/ECU was replaced.
- Plug the scan tool into the OBD port under the dash.
- Select the correct make/model/year and open the TPMS function.
- Choose relearn or write IDs.
- Either trigger each sensor to read its ID, or type the ID printed on the sensor body.
- Write the IDs to the ECU, clear stored TPMS codes, then re-read to confirm the values stuck.
- Key off, start the car, and verify the light is out.
Which Method Should You Use?
| Method | Tool Required | Time | Best For |
|---|---|---|---|
| Auto relearn | None | 10–30 min driving | New pre-programmed sensor, light just needs to sync |
| Stationary relearn | Activation tool (+ OBD on some models) | 5–10 min | Sensor IDs need to be listed in the BCM |
| OBD-II relearn | TPMS scan tool with write function | 5–15 min | Failed relearns, rotation, ECU replacement |
Sensor Spec & Fitment
| Specification | Detail |
|---|---|
| Brand | BH-Sens (Baolong Technology) |
| Frequency | 433 MHz |
| OE Number | 01725271 |
| Type | Clamp-in, pre-programmed |
| Compatible Brand | Geely |
| Dedicated OE Fitments | 5 vehicle applications |
| Weight | ~1 oz |
| SKU | BL-ST-036 |
Mistakes That Cause Repeat Comebacks
- Wrong frequency. A 315 MHz sensor will not talk to a 433 MHz system, even if the housing threads in perfectly.
- Reusing the old grommet and nut. Clamp-in stems leak at the base. Fit new hardware every time.
- Skipping the relearn after rotation. The light may stay off while the positions are silently wrong.
- Over-tightening the stem nut. Check your service manual for the spec — do not guess.
- Mixing sensor types in one set. Keep all four consistent.
Recommended Part
For ATLAS/Geely-based applications running 433 MHz, BL-ST-036 | BH-Sens 433MHz TPMS Tire Pressure Sensor | Fits Geely | OE# 01725271 is a direct OE-fit clamp-in sensor, pre-programmed and ready for any of the three relearn methods above.
FAQ
Does my ATLAS need a scan tool to relearn after a sensor swap?
Not always. Many ATLAS models auto-relearn within 10–20 minutes of driving. Keep an activation tool handy in case yours is one of the models that requires a triggered or OBD relearn to accept new IDs.
How long does an auto relearn take?
Typically 10–20 minutes of continuous driving above roughly 25 mph. If the light is still on after two clean drive cycles, stop driving and use a tool — you’re not going to brute-force it.
Will a 315 MHz sensor work if the housing fits?
No. Frequency must match the vehicle’s receiver. Installing the wrong frequency gives you a sensor that physically fits and never reports — one of the most common causes of a stubborn TPMS light.
Do I need to replace all four sensors at once?
No, but consider it. Sensors from the same production run age at the same rate, so replacing one usually means the other three are close behind. If one has failed and the rest are original, replacing the set saves you three more dismount-and-balance jobs.