Understanding TPMS Relearn on the PHAETON
The PHAETON uses direct TPMS sensors mounted inside each wheel. When you replace a sensor, rotate tires, or swap between summer/winter wheels, the vehicle’s ECU must “relearn” the new sensor IDs. Without this step, the TPMS warning light will stay illuminated, and the system won’t display accurate tire pressures.
Unlike some mass-market vehicles, the PHAETON can use multiple relearn methods. However, the exact procedure varies by year:
- 2004-2006 models: Typically use stationary magnet relearn.
- 2007-2011 models: Support auto relearn and OBD relearn.
- 2012+ models (if applicable): Usually require OBD relearn via diagnostic tool.
If you are using aftermarket sensors such as the BH-Sens 433MHz unit (OE# 2N0907275A, 314818, 36106798872), ensure they are pre-programmed or cloneable before attempting relearn.
Tools You Will Need
| Tool | Purpose | Notes |
|---|---|---|
| TPMS trigger tool (e.g., Autel TS508, Bartec) | Activates each sensor during stationary/OBD relearn | Required for most procedures |
| OBD relearn tool (e.g., Autel MaxiTPMS, Launch X431) | Sends sensor IDs via OBD-II port | Essential for 2007+ models |
| Magnet (strong rare-earth type) | Activates sensor for stationary relearn | Only for 2004-2006 models |
| Tire pressure gauge | Verify pressures before relearn | All procedures require correct inflation |
| Vehicle owner’s manual | Confirm relearn method for your VIN | Always check first |
Procedure 1: Auto Relearn (2007-2011 Models)
The auto relearn is the simplest method—no tools required beyond your car keys. It works when the vehicle is driven above a certain speed for a continuous period.
Steps:
- Set all tires to the correct cold pressure (check door jamb sticker).
- Start the engine and ensure the TPMS warning light is on (indicating the system is in learn mode).
- Drive the vehicle above 15 mph (25 km/h) for 10-20 minutes without stopping. The system will automatically detect sensor IDs as each wheel rotates.
- The TPMS light should turn off after successful completion. If it stays on, repeat the drive cycle once more.
Important: Auto relearn only works if the vehicle has been stationary for at least 20 minutes before starting. If you recently drove the car, let it sit before attempting.
Procedure 2: OBD Relearn (All Years, Preferred)
The OBD relearn is the fastest and most reliable method, especially if you are using programmable sensors like the RDE047V21 | BH-Sens 433MHz TPMS Tire Pressure Sensor | Fits Audi, BMW, Bentley, Ferrari, Lamborghini & 8 More | OE# 2N0907275A, 314818, 36106798872. It requires a compatible scan tool with TPMS functionality.
Required Tool:
- Autel MaxiTPMS TS508 or similar
- Launch X431 with TPMS module
- Snap-on TPMS tool
Steps:
- Connect the OBD tool to the vehicle’s diagnostic port (under dashboard, left side).
- Select “TPMS Relearn” from the tool’s menu. Choose the PHAETON model and year.
- Follow on-screen prompts. Typically, you will:
- Activate each sensor using the trigger tool (point at valve stem, press trigger).
- The tool reads the sensor ID and sends it to the ECU.
- Repeat for all four wheels (and spare if equipped).
- Disconnect the tool once the relearn is confirmed. The TPMS light should turn off immediately.
Tip: If using BH-Sens sensors, ensure they are set to the correct frequency (433MHz) and programmed with the correct OE ID before starting. Most OBD tools can also clone sensor IDs from old sensors.
Procedure 3: Stationary Relearn (2004-2006 Models)
Older PHAETON models use a magnet-based stationary relearn. This is a two-person job or requires a TPMS trigger tool.
Steps:
- Turn the ignition to ON (do not start the engine).
- Locate the TPMS learn button (often under the dashboard, near the steering column, or in the glovebox). If none exists, the system enters learn mode automatically after a battery disconnect or sensor replacement.
- Activate the left front sensor by holding a strong magnet against the valve stem for 5-10 seconds. The horn will chirp once to confirm.
- Repeat for the right front, right rear, and left rear in that order. Each chirp confirms sensor detection.
- Turn off the ignition. The TPMS light should go out when you restart the engine.
Alternative: Use a TPMS trigger tool instead of a magnet. This works the same way—point at valve stem, press trigger, wait for horn chirp.
Which Method Should You Use?
| Your Situation | Recommended Method |
|---|---|
| Replacing sensors with pre-programmed units | OBD relearn (fastest) |
| Rotating tires only | Auto relearn (no tools needed) |
| Using cloneable aftermarket sensors | OBD relearn (clone IDs from old sensors first) |
| 2004-2006 model with magnet | Stationary relearn |
| No TPMS tool available | Auto relearn (if supported) |
Common Mistakes to Avoid
- Skipping pressure check: Always inflate tires to spec before relearn. Low pressure can cause false readings.
- Using wrong frequency: BH-Sens 433MHz sensors are compatible with most PHAETON models, but double-check your vehicle’s original frequency (usually printed on the old sensor).
- Not clearing old codes: After sensor replacement, clear any stored TPMS fault codes with an OBD tool before starting relearn.
- Mixing sensor brands: Stick with one brand per vehicle. Mixing BH-Sens with OE sensors can cause communication errors.
Recommended Part
For a reliable replacement, consider the RDE047V21 | BH-Sens 433MHz TPMS Tire Pressure Sensor | Fits Audi, BMW, Bentley, Ferrari, Lamborghini & 8 More | OE# 2N0907275A, 314818, 36106798872. This BH-Sens 433MHz TPMS sensor fits PHAETON along with Audi, BMW, Bentley, Ferrari, Lamborghini, and eight more brands. It matches OE# 2N0907275A, 314818, 36106798872, and others. Pre-program it with your vehicle’s original sensor ID for plug-and-play installation, or use the OBD relearn procedure above if you are installing fresh units.
FAQ
How do I know if my PHAETON uses auto relearn or OBD relearn?
Check your owner’s manual or look at the TPMS light behavior. If the light blinks for 60-90 seconds after starting and then stays solid, the system is in learn mode and supports auto relearn. If the light is solid immediately, you likely need OBD or stationary relearn. For 2004-2006 models, a magnet is usually required.
Can I use the BH-Sens sensor without programming it first?
Yes, but you must either clone the ID from your old sensor (using a TPMS tool) or perform an OBD relearn to teach the new ID to the ECU. If you install a blank sensor without cloning, the TPMS light will remain on until you complete the relearn procedure.
What if the horn doesn’t chirp during stationary relearn?
First, ensure the magnet is strong enough (rare-earth magnets work best). Second, confirm you are holding it directly against the valve stem—not the wheel or tire. If there is still no chirp, the vehicle may require a different relearn sequence (e.g., starting from the right rear instead of left front). Check a model-specific guide for your exact year.
How long does the auto relearn take?
Typically 10-20 minutes of driving above 15 mph. Some vehicles require up to 30 minutes if the battery was recently disconnected. If the light remains on after 30 minutes, switch to OBD relearn or consult a technician.