2021 Subaru WRX Tire Pressure Warning Light Stays On

Resolve Tire Pressure Warning Light in 2021 Subaru WRX: Causes and Solutions

Find Repair Location
Reviewed by
Devin Cabugcal
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 WRX 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 WRX 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 WRX?

To effectively diagnose the tire pressure warning light issue in your 2021 Subaru WRX, begin with a systematic approach that prioritizes simpler solutions before delving into more complex diagnostics. Start by checking the tire pressure in all four tires using a reliable tire pressure gauge, ensuring they are inflated to the manufacturer's recommended levels, which can typically be found in your owner's manual or on a sticker located inside the driver's side door jamb. Next, inspect each tire for visible damage such as punctures, cuts, or bulges that could indicate a leak or affect pressure. Don’t overlook the valve stems; check them for any signs of damage or leaks, as faulty valve stems can also contribute to pressure issues. If everything appears normal, consider resetting the tire pressure monitoring system (TPMS), as this can sometimes resolve the warning light without further intervention. However, if the light remains illuminated after these checks, it may signal a more serious problem with the TPMS sensors or system, at which point consulting a mechanic or dealership for a professional diagnosis is advisable. By following this structured diagnostic approach, you can efficiently identify and address the underlying cause of the tire pressure warning light in your Subaru WRX.

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

When the tire pressure warning light stays on in your 2021 Subaru WRX, it can indicate several underlying issues that may require your attention. The most frequent cause is low tire pressure, which can result from natural air loss or punctures. Regularly checking and inflating your tires to the manufacturer's recommended levels is essential for optimal performance and safety. If the tire pressure is adequate, the problem might stem from the tire pressure sensors themselves. These sensors can malfunction or may need battery replacements, leading to persistent warning lights. Additionally, if the tire pressure monitoring system has not been calibrated properly, it can also trigger the warning light. If you've addressed these common issues and the light remains on, it’s advisable to seek assistance from a qualified mechanic who can perform a thorough diagnosis to identify any deeper problems. By understanding these potential causes, you can take proactive steps to maintain your vehicle's safety and efficiency.

What should I do if the tire pressure warning light on my 2021 Subaru WRX stays on?

If the tire pressure warning light on your 2021 Subaru WRX stays illuminated, it is essential to take immediate action to ensure your safety and prevent potential vehicle damage. Ignoring this warning can lead to dangerous driving conditions, such as decreased traction and increased tire wear, which may result in a blowout or other serious incidents. Begin by checking the tire pressure in all four tires, including the spare, using a reliable tire pressure gauge. If you discover any tires are underinflated, inflate them to the manufacturer's recommended levels, typically found in your owner's manual or on a sticker inside the driver's side door. Additionally, inspect the tires for visible damage, such as punctures or bulges, as these issues can also trigger the warning light. After making the necessary adjustments, you may need to reset the tire pressure monitoring system (TPMS) through your vehicle's settings or by following the instructions in the manual. If the warning light remains on despite these efforts, it is advisable to seek assistance from a qualified mechanic or visit a Subaru dealership for further diagnosis. By addressing this issue promptly, you not only enhance your safety on the road but also help maintain the longevity and performance of your vehicle.

You’ve got options with RepairPal

Whether you need a more accurate auto repair estimate or help finding a reputable shop in your area, we’ve got you covered.

2021 Subaru WRX Tire Pressure Warning Light: Causes & Fixes