2021 Subaru Forester Tire Pressure Warning Light Stays On

Resolve Persistent Tire Pressure Warning Light in 2021 Subaru Forester

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Reviewed by
Andrew Hajjar
Written by RepairPal Car Genius
Updated January 14, 2025
0%
40% chance it's the
Tire Leaking Air
0%
30% chance it's the
Wheel Leaking Air
0%
15% chance it's the
Tire Pressure Monitoring System
0%
15% chance it's
Something else
The most common reasons a 2021 Subaru Forester tire pressure warning light stays on are a leaking tire, a wheel that no longer holds air, or a faulty tire pressure monitoring system.
  • Tire Leaking Air: A puncture, valve stem issue, or rim damage can cause a tire to leak air, leading to loss of pressure.
  • Wheel Leaking Air: A puncture or damage to the tire or rim can cause air to leak, resulting in a loss of tire pressure.
  • Tire Pressure Monitoring System: A malfunctioning tire pressure monitoring system can be caused by faulty sensors or a dead battery in the sensor units.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2021 Subaru Forester tire pressure warning light stays on?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

When a relearn is needed, for any reason, the TPMS warning light will illuminate, and many vehicles will display a message relating to the TPMS system being inoperative or loosing communication. It is important to keep a watchful eye on tire pressures when this system is having issues because there is no warning available for underinflation or overinflation of the tires.

The only symptoms requiring diagnosis for the tire pressure monitoring system warning lamp is if the warning lamp has illuminated while the tires have correct air pressure, or if the air pressure for the tires is out of specification and the warning lamp is off. This is because the overwhelming majority of cases where the TPMS lamp illuminates is due to the change in ambient temperature.

What steps should I take to diagnose the tire pressure warning light issue in my 2021 Subaru Forester?

To effectively diagnose the tire pressure warning light issue in your 2021 Subaru Forester, begin with a thorough assessment of your tire pressure. Utilize a reliable tire pressure gauge to check each tire, ensuring that the pressure aligns with the specifications found in your owner's manual or on the sticker located on the driver's side door jamb. If you discover any discrepancies, adjust the pressure accordingly by inflating underinflated tires or releasing air from those that are overinflated. Next, conduct a visual inspection of all tires for any signs of damage, such as punctures or bulges, which could indicate a leak. Additionally, remember to check the spare tire, as it can also trigger the warning light if its pressure is low. After making any necessary adjustments, consult your owner's manual to determine if a manual reset of the tire pressure monitoring system (TPMS) is required. If the warning light remains illuminated despite these efforts, it may signal a more complex issue with the TPMS sensors or system, necessitating a visit to a qualified mechanic for further diagnosis and repair. By following this structured approach, you can efficiently identify and resolve the tire pressure warning light issue in your vehicle.

What could be causing the tire pressure warning light to stay on in a 2021 Subaru Forester?

When the tire pressure warning light stays on in a 2021 Subaru Forester, it can signal several common issues that DIYers can troubleshoot. The first step is to check the tire pressure in all four tires, as low pressure is the most frequent cause of the warning light. If the pressure is within the recommended range, the next potential issue could be a faulty tire pressure sensor, which may need to be replaced or recalibrated. Additionally, some sensors are equipped with batteries that can deplete over time, leading to persistent alerts. It's also important to inspect the wiring and connections associated with the tire pressure monitoring system for any signs of damage or loose connections, as these can interfere with proper functionality. Extreme temperature changes can also impact tire pressure readings, so checking the tires when they are cold will yield the most accurate results. If these steps do not resolve the issue, the system may require recalibration to reset the warning light. Should the light remain illuminated despite these efforts, seeking assistance from a qualified mechanic is recommended for a comprehensive diagnosis.

How urgent is it to address the tire pressure warning light that stays on in a 2021 Subaru Forester?

Addressing the tire pressure warning light in your 2021 Subaru Forester is not just a matter of convenience; it is a critical safety concern that requires immediate attention. Ignoring this warning can lead to serious consequences, including compromised vehicle handling and stability, which can increase the risk of accidents. Low tire pressure can also result in uneven tire wear, significantly shortening the lifespan of your tires and potentially leading to a dangerous blowout while driving. Furthermore, underinflated tires can negatively impact your fuel efficiency, causing you to spend more on gas over time. To ensure your safety and the optimal performance of your vehicle, it is essential to check your tire pressure as soon as the warning light remains illuminated. By inflating your tires to the recommended levels and addressing any underlying issues, you can prevent further complications and maintain the reliability of your Subaru Forester. Regular monitoring of tire pressure is a simple yet effective way to safeguard your vehicle and enhance your driving experience.

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