Quick AnswerA Aeolus running winter tires still needs TPMS sensors the vehicle can read — either move the original sensors to the winter wheels or buy a second pre-programmed set in the correct frequency. Tire pressure drops roughly 1 psi per 10°F of temperature fall, so set pressures indoors and recheck after the first cold night. Store off-season wheels clean, dry, and away from strong magnets.
Why Winter Swaps Trip the TPMS Light
Your TPMS module doesn’t measure tires — it listens for radio IDs. Each sensor broadcasts a unique ID at a fixed frequency, and the module only accepts IDs it has been taught. Change one variable and the light comes on.
Three things go wrong at a winter swap:
- Bare winter wheels. Used steel rims usually arrive with no sensors at all.
- Wrong frequency. Many Chinese-market vehicles, including Aeolus models, run 433 MHz. A 315 MHz sensor will never be heard, no matter how many relearn attempts you make.
- Sensors moved but not relearned. Even if you transfer the originals onto the winter rims, some vehicles need an activation or relearn step before they report.
What Cold Actually Does to Tire Pressure
Air contracts as it cools. The working rule in the shop: about 1 psi per 10°F (roughly 0.07 bar per 5°C) of temperature drop. Winter tires set at 35 psi in a 70°F shop will read low after one cold night outside.
| Ambient temp (set at 70°F / 21°C) | Approx. loss | 35 psi becomes |
|---|---|---|
| 50°F / 10°C | ~2 psi | ~33 psi |
| 32°F / 0°C | ~4 psi | ~31 psi |
| 0°F / -18°C | ~7 psi | ~28 psi |
A 4–7 psi deficit is enough to trigger the warning light and enough to hurt winter traction and chew the shoulder blocks. Set pressures in a heated space, then verify with a good gauge outdoors on the first cold morning. Don