Understanding Subaru Impreza’s Tire Pressure Monitoring System (TPMS)
The Subaru Impreza features a TPMS that alerts drivers if tire pressure drops below safe levels. Most models rely on an indirect TPMS, which monitors wheel rotation speed to detect pressure differences, while some newer models use a direct TPMS with individual sensors in each tire. Both systems are designed to improve safety, fuel efficiency, and overall vehicle performance. However, false or frequent TPMS alerts can indicate issues that need to be addressed.
Common Causes of Subaru Impreza Tire Pressure Sensor Faults
- Temperature Fluctuations
- Sudden changes in temperature, especially during colder months, can cause tire pressure to drop, triggering a TPMS alert.
- Sensor Battery Depletion (Direct TPMS)
- For models with direct TPMS sensors, the sensor batteries generally last about 5-7 years. When these batteries are low, they may cause false alerts.
- Tire Changes and Rotation
- The TPMS system in Subaru models may require recalibration after rotating or changing tires, especially if new tires differ in size.
- Sensor Damage or Wear
- Rough road conditions, debris, or frequent tire changes can sometimes damage the sensors, leading to inaccurate readings or frequent alerts.
- Software or Calibration Issues
- Some Subaru models may experience software issues that require a reset or update, particularly after maintenance or tire service.
Steps to Resolve TPMS Faults in Subaru Impreza
1. Verify Tire Pressure Manually
- Use a tire gauge to check each tire’s pressure and ensure it aligns with the recommended PSI for the Subaru Impreza. Adjust as needed.
2. Reset TPMS Alert Through the Dashboard
- Many Impreza models allow you to reset the TPMS system after verifying tire pressures:
- With the car parked, turn the ignition to the “On” position without starting the engine.
- Navigate to the Settings > Vehicle Settings > TPMS and select Reset TPMS if available.
3. Drive to Recalibrate the System
- In Impreza models with indirect TPMS, the system may recalibrate after 10-15 minutes of driving above 25 mph. This helps the system recognize corrected pressure levels.
4. Check Sensor Health (For Direct TPMS Models)
- For models with direct TPMS, enter Service Mode or have a service provider check individual sensor readings to determine if any sensor shows low battery or malfunction.
5. Minimize Interference
- If you experience frequent alerts in specific locations, interference from nearby electronics could be the cause. Moving the car and restarting it in a different area can clear temporary alerts.
6. Schedule Service for Sensor Replacement
- If a sensor shows low battery or has been damaged, it’s best to have it replaced by a certified Subaru service center. Only Subaru-compatible sensors should be used for accurate readings.
Preventative Tips for Maintaining TPMS in Subaru Impreza
- Monthly Pressure Checks: Regularly inspect tire pressure to prevent alerts caused by minor drops.
- Recalibrate After Tire Rotations: Ensure the system is reset or recalibrated after tire rotations or replacements.
- Avoid Abrupt Temperature Shifts: If possible, park in shaded or temperature-controlled areas to reduce pressure fluctuations.